east302
I'm Awesome
Truck is 1998 K1500 with the JB5 (10") drums. This might be a bit long...
The brakes were squealing in the front and back, along with a grating sound from the back and what felt like a sticking shoe--when I let off the brakes, the truck wouldn't move unless I touched the gas. Last week, I replaced the drums, shoes, hardware and one leaking wheel cylinder. I also replaced the rotors and pads. Pads, shoes, drums and rotors were the AC Delco Durastop brand. I thought they would be made in the US but saw China stamped on the boxes. It figures.
Both backing plates did have gouges in the little pads, some deeper than others. I didn't replace the plates or grind the spots down--just greased the contact points and put the new shoes on. I know that was not the best idea, but I didn't have the luxury of spending additional time to pull the axles and replace the plates.
With the new parts, the noises are gone and the back doesn't stick. But, I now have a pulsing pedal and a rear hop when slowing down between 50-30 mph under light to moderate pedal pressure. It feels like the back of the truck is bouncing. Thinking it was coming from the front, I checked the runout on the new rotors. I didn't do it at the initial installation. One had about 0.001" which is in spec, the other was 0.004" independent of where it was placed on the hub. I changed out the new Delco rotors for some from Advance Auto and that greatly reduced the pulsation but didn't eliminate it. The new rotors are both are right at 0.001", lugs on all wheels are torqued to 125 ft-lbs in the correct pattern. Calipers and connected hoses are about a year old. The calipers retracted fine, slides moved easily though one of the pins had a few gray spots on it.
I still have a slight pulsing pedal but don't feel it in the steering wheel. I still have the rear hop which I can duplicate by using the e-brake.
I bled the brakes at all corners. I've adjusted the drums and have good pedal feel.
Would the gouges in the plates cause the shoe to shift and cause the pulsation or does this sound like an out of round drum? Or both maybe? I already got one out of spec rotor, what are the odds that I got a bad drum as well?
I'm thinking I should replace the backing plates (along with the remaining old wheel cylinder and axle seals) but don't want to throw money at this if it isn't the issue. Where should I go next? I'd appreciate some suggestions for diagnosing this.
The brakes were squealing in the front and back, along with a grating sound from the back and what felt like a sticking shoe--when I let off the brakes, the truck wouldn't move unless I touched the gas. Last week, I replaced the drums, shoes, hardware and one leaking wheel cylinder. I also replaced the rotors and pads. Pads, shoes, drums and rotors were the AC Delco Durastop brand. I thought they would be made in the US but saw China stamped on the boxes. It figures.
Both backing plates did have gouges in the little pads, some deeper than others. I didn't replace the plates or grind the spots down--just greased the contact points and put the new shoes on. I know that was not the best idea, but I didn't have the luxury of spending additional time to pull the axles and replace the plates.
With the new parts, the noises are gone and the back doesn't stick. But, I now have a pulsing pedal and a rear hop when slowing down between 50-30 mph under light to moderate pedal pressure. It feels like the back of the truck is bouncing. Thinking it was coming from the front, I checked the runout on the new rotors. I didn't do it at the initial installation. One had about 0.001" which is in spec, the other was 0.004" independent of where it was placed on the hub. I changed out the new Delco rotors for some from Advance Auto and that greatly reduced the pulsation but didn't eliminate it. The new rotors are both are right at 0.001", lugs on all wheels are torqued to 125 ft-lbs in the correct pattern. Calipers and connected hoses are about a year old. The calipers retracted fine, slides moved easily though one of the pins had a few gray spots on it.
I still have a slight pulsing pedal but don't feel it in the steering wheel. I still have the rear hop which I can duplicate by using the e-brake.
I bled the brakes at all corners. I've adjusted the drums and have good pedal feel.
Would the gouges in the plates cause the shoe to shift and cause the pulsation or does this sound like an out of round drum? Or both maybe? I already got one out of spec rotor, what are the odds that I got a bad drum as well?
I'm thinking I should replace the backing plates (along with the remaining old wheel cylinder and axle seals) but don't want to throw money at this if it isn't the issue. Where should I go next? I'd appreciate some suggestions for diagnosing this.
Last edited:
