UFP DB-35 vs. DB-42

Unique Functional Products, UFP as they are commonly known, offers two different series of disc brakes. They offer a DB-35 and a DB-42 and since the parts are not interchangeable it is essential to be able to identify what you have.

UFP DB35The DB-35 visually appears more similar to an automotive caliper.  It will have two mounting ears below the body to attach the caliper directly to the axle brake flange. The rotor is also identifiable but it can be a little more difficult. On the rotor/hub there will be a minimumRotor_small thickness of 17mm (MIN THK 17.0 MM) stamped  on the inside of the back.


DB42_smallThe DB-42 is visually unique and consists of a thick caliper body that houses the piston, and a metal shroud that will house the pads. The DB-42 will have only one mounting bolt hole located in the center of the bleeder valve and brake line port. On the rotor/hub there will be a minimum thickness of 22.40mm (MIN THK 22.40 MM) stamped on the backside.

Factory O.E.M Boat Trailer Parts

FactoryPartsTrailer Parts Superstore® carries a wide selection of Factory O.E.M. trailer parts in addition to our large assortment of aftermarket equipment and accessories. Many parts on a trailer are made by their respective manufacturers such as “Wesbar” lights or “Stoltz” rollers. Although we carry those items, we also carry parts made specifically for the following trailer companies:

Most boat trailer manufactures used parts unique to them which can make it hard to find some of these parts. These factory direct parts are OEM replacement parts and can be matched by OEM part numbers or by dimension and descriptions.  We try to offer one of the largest selections of Factory O.E.M trailer parts out there. We currently carry factory direct parts from 8 of the leading boat trailer manufactures and are still adding more. Don’t forget to to check our complete list of Factory parts here, FACTORY PARTS PAGE , as we are constantly adding items.

Self-Adjusting vs Manual Adjusting Electric Brakes

The two main types of ELECTRIC BRAKE ASSEMBLIES for axles 7K and below are Forward Self Adjusting (FSA) and Manual adjusting. The difference between the two is that the forward self-adjusting brakes will adjust themselves as needed so that they are always at the optimum position. Manual brakes must be adjusted manually via the star adjuster on the back side of the brake assembly as needed. Due to the reduction of required maintenance, the FSA brakes are becoming a lot more popular.

FSA_BrakeIt is important to be able to identify which type is already on your trailer so that maintenance or replacing is done correctly. This cannot simply be done by looking for a star adjuster because both types have that. The FSA brakes will have a wire that will run from about 9 o’clock to 1 o’clock. On the 1 o’clock side it will have a banjo looking fitting (shown to the left). The manual adjusting brake will not have this wire running across the inside of the assembly.Manual_Brake


Another way to identify between the two is the bottom spring.  On an FSA brake assembly (shown above) the spring will be straight and wrapped around the adjuster.  On a Manual adjusted brake assembly (shown to the right) it will be a curved spring below the adjuster.

Due to the way that these brakes operate we absolutely recommend being consistent through the trailer. It is NOT SAFE to run both types of brakes on the same axle. It is NOT RECOMMENDED to run both types of brakes on the same trailer (different axles) but if the brakes on each axle match, it is operable. Problems will occur if one side of the trailer is adjusting automatically and brakes on the other side are not.

A final thought about FSA brakes assemblies. It is important to keep in mind that FSA brakes are automatically adjusted to perform at their best. This means they may not last as long as manually adjusted breaks. This is because manually adjusted brakes, if not adjusted regularly, are not being used to there potential and the shoes wear slower.

Decoding Metric Trailer Tire Sizes

For someone who might not be familiar with the numbers and letters on a TRAILER TIRE, replacing one could prove frustrating. We will break down the metric size designation found on most trailer tires so that identifying your needs should be simple.  For an example we will be identifying the meaning of the numbers and letters on a


ST stands for “Special Trailer” and signifies its use for trailers only.

205 is the “Section Width” of the tire in millimeters when mounted on the specified rim and inflated to the maximum pressure. The Section Width is the measurement of the overall width of the tire not including any protruding letters or protective ribs around the outer sidewall. To convert this to inches simply divide the number by 25.4
205 divided by 25.4 = 8.07″

75 is the aspect ratio of section height to section width. Also known as the series number or profile of the tire, this number means that the height of the tire is 75% of the width. So since we know that the Section Width is 8.07″ then that means 75% of 8.07 is the section height. (8.07 x .75 = 6.05″)

R designates the tire as a Radial Ply as appose to a Bias Ply (D Designation). For a more technical look at the difference check this out.

14 is the rim size.  This is the diameter of the rim measured in inches from bead to bead.  The actual physical diameter will measure slightly larger then the listed size because the beads are inside the lip of the rim.

Another number set that you will find on a tire is the Birthday.  This will be represented by a 4 digit number inside of an oval. The first two digits are the Week # and the second two digits are the Year.  0214 Would mean they were manufactured in the 2nd week of 2014.

We hope this was helpful in identifying what the numbers and letters mean on your trailer tire.  Remember to always run your trailer tires at maximum PSI filled when cold.  To check out our full list of tires and more Tech info visit us at www.TrailerTires.com

Snow Plow Parts and Salt Spreaders

PlowSpreaderXmasTis’ the Season for Snow Plow Parts and Salt Spreaders.  We have been steadily expanding our offering on both Plows and Spreaders. We stock a wide selection of Aftermarket Snow Plow Parts and Accessories for most major brands including Meyer, Western, Diamond, Fisher, Sno-Way, Blizzard and Boss.  On the spreader front we offer, Walk-Behind and Tailgate Spreaders for residential and light commercial use and Municipal Hopper and Dump spreaders for municipalities and contractors.

We carry a wide range of different Snow Plow Products including, Angling Cylinders, Solenoids, Curb Guards, Light Kits, Wiring Harnesses, Control Assemblies, and much more.  We also carry ‘Under the Seat’ emergency kits for most OEM’s.  The kits include some of the crucial/most common hardware to complete a roadside repair on common issues.  All in stock orders with snow plow parts on them, if received by 2:00 pm, will ship the same day.

The Spreaders that we carry range in size from a 1.5 Cubic Ft. all the way up to a 13.8 Cubic Yard municipal hopper.  We carry spreaders capable of both salt and sand operations. The Spreaders, because of their size, ship directly from the manufacture (refer to individual spreader for ship times).

Trailer Spindle Identification

There are a few common spindle sizes found on Trailer Axles rated at 3,500lbs or less.  These are the most common axles found on Boat Trailers, Small to Medium Sized Utility Trailers, Snowmobile Trailers, and more.  There are 4 main areas of importance on the spindle to consider when purchasing a Trailer Hub or Bearings.  They are, Seal Surface, Inner Bearing Surface, Outer Bearing Surface, and Thread Surface.

One of the most common trailer spindles out there is a 3,500lb “Tapered Spindle” (when bearings have different Inside Diameter’s).  This spindle is usually found with a 4-hole brake flange welded to the axle.  The flange is there for Trailer Brakes to be mounted but does not have to be used.  Here is a diagram showing the 4 important areas on a 3,500lb spindle:

Another commonly found spindle is when both bearing Inside Diameter’s are the same and this is called a “Straight Spindle”.  These spindles are commonly found on axles rated at less than 3,500lbs.  Most trailer manufactures used and still use what is referred to as a “Standard Spindle” while others used, less commonly, what is referred to as a “Short Spindle”.  If the Hub is available to measure, than Hub Length* can be used to determine the difference.  If the hub is not available you can measure the spindle from the seal surface shoulder to the beginning of the thread as shown:

*Hub Length is the distance through the center of the hub from casting edge to casting edge.  A “Standard Spindle” hub will measure between 4” and 4-1/16” while a “Short Spindle”  hub will measure 3-1/2”.

Measuring A Boat Trailer Wobble Roller

Wobble Rollers are found on boat trailers that have a hand winch or power winch to pull the boat up onto the trailer.  The rollers are designed to provide a minimum amount of resistance and allow the boat to roll up to the winch stand.  The way the rollers are mounted is supposed to help center the boat as well. When replacing the wobble rollers on your boat trailer there are a few key measurements to take before purchasing.

Overall Roller Dimensions:
Measure the Diameter of the roller and the width of the roller

Bushing ID:
Measure the inside diameter of the bushing/The size of the opening from top to bottom.

Shaft Diameter:
Measure the diameter of the shaft at its widest point (some may not be completely round).

NOTE:  Shaft Diameter and Bushing ID should always be different. The difference is usually 3/32” but can vary. The difference is what will allow the roller to wobble.

Bushing/Bearing Length:
Measure the distance through the center of the bushing from one edge to the other.

Trailer Tires & What to Consider

TrailerTiresThere are many things to consider when determining which Trailer Tire is right for your trailer.  We are going to discuss the main points that need to be addressed when outfitting your trailer with new Trailer Tires. Should you use Radial or Bias-Ply? Should you use Load range C or Load Range D? Do I have to use an ‘ST’ tire?  These are all good questions.

First off, we will revisit the Radial vs. Bias-Ply debate that was covered in a previous blog, only today’s entry will be much briefer.  Radial tires are going to be better suited for highway/high volume usage.  This is because they tow better at higher speeds and last longer than a Bias. They also shed heat better, reducing the risk of blow-outs on long hauls.  Bias Ply tires are cheaper alternatives that perform just fine under moderate to low use on mainly secondary (around town) roads.  You can absolutely use them on the highway; they just won’t perform as well or last as long as a Radial.

Secondly, we will address how to determine the appropriate Load Range (L.R.) for your trailer tires.  I would like to address the common perception that a higher L.R. automatically means a higher quality tire; this is not always the case.  The L.R. should be determined by using the GVW or Gross Vehicle Weight.  Depending on the type of trailer, tongue weight can be anywhere from 10-20% but we do not like to use that weight in our equation so that there is a built in safety margin.  Take the GVW and divide it by the amount of tires.  This will give you the minimum poundage that each tire should be rated at.  Keep in mind that the higher the L.R., a higher PSI will be needed.  If you go over and above on L.R. then the PSI will be higher than needed making the tires very hard and bouncy.

Finally, it is always recommended that an ‘ST’ or ‘LT’ tire should be used on trailers.  This is a common question because many trailers are outfitted with tires that have a ‘P’ on them.  A ‘P’ on the tire means that it is meant for use on a Passenger vehicle (car tire).  ‘P’ tires are round and rubber and will surely fit on a trailer, but are not recommended due to the construction of the tire.  ‘ST’ tires are designed to be towed and have stronger sidewalls needed for trailers.

We hope this was helpful but if you have additional questions, please give us a call @ 1-800-453-7379.

Boat Trailer Disc Brakes, What you need to know.

DiscBrakeDisc brakes are not all created equally.  Where and how you use them should help you decide on what to buy. Today’s disc brakes typically come in three types: painted or E-coat/ Dacromet coating, or stainless steel. The calipers are made the same, with some manufacturers offering them in aluminum also. If you plan to use them with an electric over hydraulic actuator, you will have to go with one made from steel. The aluminum calipers may not able to handle the added pressure from this type of system, designed for disc brakes.

DacSSkodiak In fresh water the E-coat will work well, but for a little extra money you can go with the Dacromet coating which should last longer with less maintenance. In brackish or salt water the E-coat offers little protection and is not an option you should consider. There are hybrid kits where the hub and rotor have the Dacromet coating, but the caliper is stainless steel.  Being the most important part of the system, this will provide the best caliper available at a reduced cost of an all stainless system.

 SSKodiakIf you use the trailer often in salt or brackish water, going with an all stainless system is your best option. The initial cost may be a bit shocking over the other options, but down the road you will thank yourself for having spent the extra money. Typically the Dacromet or Dacromet/Stainless kits offer a 3 year warranty, where the all stainless kit (offered in both 10″ and 12″ ) will double this and provide a 6 year warranty. If you are tired of working on your trailer brakes instead of being out on the boat, consider going with all stainless disc brakes like what we offer from Kodiak. Having peace of mind in my opinion while towing, is priceless.

Written by Chris B.

RV Time!!

RV_trailerIt’s the great American summer, kids off school, everyone taking vacations and planning road trips with their RV’s that sat waiting through the long winter for this opportunity. Dust everything off, fire everything up and load that puppy up. It’s time to go where you’ve never gone before, see things you always wanted to see in the comfort of your own RV. Finally, wheels rolling!

But what happens when the heat and the humidity start to follow you on your road trip? Do you know the main cause of failures on RVs and campers is brought on by the blazing heat of the summer?

Tires, tires, tires.

The most important part to your trip and yet often the most overlooked part as well. If you’re hot then you know the black top is hot, if the blacktop is hot then the rubber tires are suffering. Take that heat and drive down into Texas or lower New Mexico and you could be in a bad place if you haven’t checked them recently. Always check the tire pressure in your tires and look them over before any trip, be it large or small. You never know when a little rubber could come between you and your vacation experience!

There’s another beast that can make your vacation hot, sweaty and miserable. It happens suddenly, that warm feeling and sweat starts to trickle down your back, suddenly you’re sticking to the seat when you weren’t a moment ago. You don’t want to look but you have to, glance at the thermostat and you know instantly.

The air conditioning stopped working!

With the heat waves hitting the country it’s no wonder people are grumpy and on edge, but take away that precious AC and you’ll see a whole new side to it. Instant vacation self-destruction.

After all, if you have to sweat you should be on the beach, not stuck in four lanes of stopped traffic miles from the next rest stop.

Don’t get caught in the ragged heat of the summer blues. It’s supposed to be an enjoyable vacation full of fun and beaches, road trips and sunshine. But it’s not really a vacation if you spend it being miserable and spending money you didn’t have to on hotel rooms because a part on your RV failed you at an inopportune moment.

No one wants their vacation destroyed and no one wants to deal with grumpy kids when they’re taking the RV across the country. Stock up on all your RV and summer vacation needs at Trailer Parts Superstore!!!