I have been chasing a bounce under braking on a 96 GMC standard cab short bed 1500. I have had the truck for 1 year and it is a high mileage truck. Bounce is in the seat and slightly noticeable in the brake pedal. Not consistent. Usually worse under light braking and around 40 MPH brake application speed.
Truck is stock suspension, everything (except knowing if front lower A arm bushings are good) is tight and has been inspected. I replaced the front rotors with Bosch parts and matching ceramic pads. I replaced the calipers, sliders and extension hoses due to right hand pull. Corrected that issue. I put on new rear drums (Oreilly house brand) and shoes (Oreilly house brand bonded) and new wheel cylinders due to finally having rivets touch drums in rear… I replaced the hydraulic rubber line to the rear axle due to mouse bites in the hose. Master cylinder also failed and I replaced that. Many times ahs fluid been flushed through the brakes system and appears clean. No lights on dash from ABS module.
I put on KYB GR2 rear shocks and Monroe heavy duty units for the front. This rides nice.
The tires are not round! I’ve had this problem before on a different vehicle and some of the issue could be from this. But the store I bought from claims they are good and will not make them up. When I put it on stands and run the truck in 1st gear I can see what I consider a large deviation, over 1/8 inch.
Last weekend I changed the rear seal in the trans and found the rear most U joint bad/binding in only one set of caps. Thought I had the culprit. I replace front and rear u joints with no change to the bounce…
So my question, has anyone had problems with bonded shoes on rear drums and fixed it with riveted shoes. Only difference is a place for some material to gather instead of rolling all the way across the shoe face. On the 10 inch rear drum setup, the bottom of the shoes are fixed unlike the older setup or the 11 in drum set-up. The application of the brake will jut into the drum if the drum is not round too. So I think deviations back here in drum surface could be more felt than the axles with the adjuster floating around at the bottom.
I am planning on pulling the new drums off, roughly 8K since install, and have Oreilly check them for true, maybe have them resurfaced. I have new AC Delco shoes at home now that are riveted. I have my hopes high this will fix the issue, but want to know if others have done the same thing or found other ways to fix this.