Rear Disk inner pad wearing faster ?

[axisg]

Not on the G but on my DD AWD Safari van. I did brakes all way round in Dec ( 25 thousand kms ago ). When pulling the boat on the weekend ( no brakes on the boat trailer BTW ) I noticed a slight shimmy on the rear axle pulling the back end to the right ( passenger side ) when braking. Nothing severe, and nothing really that noticeable every time you brake but it was enough to notice 4 or 5 times during the hour drive there and again going back. I mentioned it to my passengers and nobody else felt it.
When I did the brakes I had 1 slider on the PS rear that was a little sticky and had a ripped boot so I replaced the whole mounting arm with sliders intact ( it was cheaper than rebuilding my old junk to get the loaded caliper ). I had a couple hours to kill today so I dug a little deeper.

I popped off the DS rear caliper. Both pins are good, pad wear is even. Pushed the piston in caliper back ( smooth ) pumped the caliper piston out an inch or so and pushed it back in again ( smooth )

Next on to the culprit ( I think ) PS Rear Caliper. Both pins are good, inner pad is worn 30% to 40% more than the outer ( the outer pad is roughly the same thickness as the 2 on the DS ). I pushed the piston in caliper back ( smooth ) pumped the caliper piston out an inch or so and pushed it back in again ( smooth )

Typically I would just toss on a loaded caliper and call it a day but I already did that back in December. Everything moves smoothly. I didn't notice any binding and the caliper came out smooth and even when the brakes were applied.

For giggles I pulled both front wheels and all 4 pads are wearing evenly. The van doesn't pull nor does the pedal vibrate. I only notice this when pulling the boat trailer ( probably 2500 lbs ) and only this last week.

 

[ed1948]

From what I've experienced it'd always the curb side of the car/truck that has disk brake problems - probably from the flung up road dirt. Is the parking brake releasing fully?

 

[deanlemans81]

When you removed the caliper for inspection, did you remove the pads themselves. The pad may be stuck in place and maintain pressure when brakes are released.

 

[axisg]

Parking brake is not hanging up ( they are actually backed off quite a bit just to be sure )
I took the pads out to inspect them and the Stainless hardware in the caliper. Everything is in there snug but not binding.
For the price I may just toss another loaded caliper on there, maybe even do both of them before the snow flies. I don't want to get caught in a panic stop in the snow and have it pull me sideways

 

[drogg1]

Sounds like a seized caliper but you said they move smoothly. I had a similar situation that turned out to be a collapsed brake line.

 

[pontiacgp]

is the rotor in the center of the caliper?

 

[axisg]

My son had a day off school yesterday so he got roped into coming to work. Its such a pia trying to bleed brakes by yourself !
We swapped out both rear calipers, pads and rotors. Replaced all the brake fluid at all 4 corners while we were at it ( it looked like cola ). Lubed it up, oil change and tossed the snows on there. She's ready for winter service now !
I didn't even get a test drive in. I will be hauling the boat to work next week to get it ready for storage. Then up to a friends place in Barrie where it will rest for the winter.
I love the cooler temps this time of year but so much to do on the rigs and around the house to get ready for the cold !