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Username Post: CPP Kit on 59 stock Impala - need help troubleshooting        (Topic#340089)
Russ 
Senior Member
Posts: 2128
Russ
Loc: Sacramento, CA USA
Reg: 12-16-99
10-24-16 01:43 PM - Post#2658086    

I installed the front disc kit for stock spindles. It's worked fine for two years. Recently I've noticed some squealing. And I noticed a little bit of drag when trying to coast at slow speed.

I raised the car up and spun the wheel. There's some drag on the discs. The driver wheel doesn't move freely without some muscle. The passenger wheel spins a bit but stops quickly.

So, I'm headed out tonight to troubleshoot. Any ideas of where to look? I am going to remove the wheel and visually inspect the discs, pads, and rotors and check for leaks etc.

1. Check the brake pedal and linkage to make sure there's no binding and that the pedal returns normally.

2. Can I make any adjustments on the proportioning valve?

3. Do I need to see if the rear wheels freely spin (indicating if rear brake line pressure is OK)?

I'm going to track down the installation guide that came with the kit and check for troubleshooting tips as well.

Thanks
Russ



 
Bel Air kiwi 
"3rd Year" Silver Supporting Member
Posts: 3813
Bel Air kiwi
Loc: New Zealand
Reg: 04-24-14
10-25-16 01:26 AM - Post#2658167    
    In response to Russ

Hi Russ, Disc brakes are meant to drag a little bit, but it really is next to nothing. Just self cleaning and drying plus keeping big stones out.

If the wheel is off the ground you should hear the light contact as a whooshing sort of scraping sound more than feel it as a heavy resistance.
Put a dust mask on and blow all the dust and crap out of them and try again.

If not look for lack of free-play between the pedal and booster or booster and master cylinder.
Does you brake pedal have a return spring to stop its own weight applying pressure.

Residual line pressure valves are very basic and don't tend to fail on. If they tear or loose tension they should work less.
Do your calipers slide on pins as they can get gummed up and stay out.
If your pads are badly worn the pistons can be so far down the bore of the caliper they start to tilt slightly and don't retract.

Cheers Kiwi.


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