Disc Brake Identification

[otteray]

I need to replace the pads. But the old manual that came with my 2003 trailer is for a DB-42 disc brake. Mine don't look like one in my manual. Can someone id these?
Those aren't cracks in the photo, they are cobwebs

 

[alldodge]

I'm finding the UFP DB-35 is a 12 inch diameter rotor and the DB-42 is a 10 inch

Scratch that
the 35 and 42 both have a 10 and 12 inch disk
Depends on lugs, size and material

 

[otteray]

I'm finding the UFP DB-35 is a 12 inch diameter rotor and the DB-42 is a 10 inch

Scratch that
the 35 and 42 both have a 10 and 12 inch disk
Depends on lugs, size and material

But they are completely different shape caliper body. I searched some more, and pretty sure mine is DB-35 model. Has anyone here installed pads for these? I can't find instructions anywhere for it.

 

[alldodge]

If your unable to find exact instructions, calipers are pretty much all the same

If your caliper rotors are good to reuse

Remove caliper
If your not replacing caliper, remove master cylinder fill cap but leave loose on top to keep dirt out

Use C-clamp and push caliper piston(s) back into caliper.

Remove C-clamp and install new pads

Install calipers and work trailer receiver to extend pistons back to rotors

Refill brake fluid as need, bleed calipers as needed

 

[otteray]

If your unable to find exact instructions, calipers are pretty much all the same

If your caliper rotors are good to reuse

Remove caliper
If your not replacing caliper, remove master cylinder fill cap but leave loose on top to keep dirt out

Use C-clamp and push caliper piston(s) back into caliper.

Remove C-clamp and install new pads

Install calipers and work trailer receiver to extend pistons back to rotors

Refill brake fluid as need, bleed calipers as needed

Okay thanks. That is very helpful, since the only other disc brakes I ever installed were on a mountain bicycle. Not nearly the same.

 

[04fxdwgi25]

UFP 35 Manual

 

[otteray]

If your unable to find exact instructions, calipers are pretty much all the same

If your caliper rotors are good to reuse

Remove caliper
If your not replacing caliper, remove master cylinder fill cap but leave loose on top to keep dirt out

Use C-clamp and push caliper piston(s) back into caliper.

Remove C-clamp and install new pads

Install calipers and work trailer receiver to extend pistons back to rotors

Refill brake fluid as need, bleed calipers as needed

Thank you; but why loosen fill cap?

 

[alldodge]

Thank you; but why loosen fill cap?

When the pistons get pushed back into their bores, the brake fluid is pushed back into the master cylinder. There could be more then the master can hold, it needs to go somewhere. Might spill out of can use something to suck excess out

 

[otteray]

When the pistons get pushed back into their bores, the brake fluid is pushed back into the master cylinder. There could be more then the master can hold, it needs to go somewhere. Might spill out of can use something to suck excess out

Thanks for the tip.
I watched a couple videos on changing pads. It does seem pretty straightforward.
Pads arriving this weekend and I'll give it a shot. Meanwhile I'm hosing down those rusted mounting bolts with penetrating oil. Probably haven't been touched in 20 years.

 

[bruceb58]

Do yourself a big favor and loosen the bleeder screws while pushing the piston in and then do a complete brake fluid flush.

 

[otteray]

That was hellish loosening the caliper bolts that hadn't been touched in 20 years. But the job is done! I sprayed them off extra well after using the boat today. Wheel lug nuts too; those were a real pain. 6' cheater bar needed to remove. Maybe loosening them yearly would be helpful.
Thanks for the guidance!

 

[richw46]

That was hellish loosening the caliper bolts that hadn't been touched in 20 years. But the job is done! I sprayed them off extra well after using the boat today. Wheel lug nuts too; those were a real pain. 6' cheater bar needed to remove. Maybe loosening them yearly would be helpful.
Thanks for the guidance!

If you've ever had to change a boat trailer tire on the side of the Interstate you'll be happy if you do something to make it easier. Take the wheel off and clean the threads on the studs and lugs-Do not grease them. I had a situation where, after years of not removing a wheel, I had an extremely difficult time getting the wheel off the hub-rotor, even after getting the lugs off. Now, as part of my yearly maintenance, I put some wheel bearing grease on the hub-rotor; a dab between the studs, then smeared onto the surface. This prevents the hub and wheel from sticking together.

 

[Lou C]

I’ve been doing that for years here in the salt pond. The best greases I’ve used are Evinrude triple guard & Lucas Marine grease (blue).

 

[richw46]

I’ve been doing that for years here in the salt pond. The best greases I’ve used are Evinrude triple guard & Lucas Marine grease (blue).

I use the Evinrude grease on the Mercury prop shaft to prevent seizing. I use Lucas green Xtra HD grease in the trailer hubs and bearings. I use Lucas Red 'n Tacky on the 4Runner drive shaft U-Joints. Good stuff, even in fresh water