roadwarrior
Well-known member
- Joined
- Nov 8, 2013
- Messages
- 53
- Reaction score
- 8
- Location
- Corona (Beer), California
- My Car
- 1971 Sportroof, original V8 gage a/c 3spd car that was very unloved
1971 convertible purchased from original owner
Hi All,
Working on the rear brakes on my 71 Sportroof. Car was originally a 302-2V with a 3 speed manual and 8" rear. Rear axle was converted to a 9" from a 69 Cougar, but the rear backing plates from the 8" were changed over to the 9". Did this with a sealed system as I had already replaced the rear shoes and cylinders and didn't want to open everything up again.
I replaced rear shoes when I first got the car and do not remember being asked what width I needed, was handed a box and installed them. They are currently 1-3/4" wide.
The drums the car had when I got it were hosed and were exchanged for the drums from the 9" rear end, which I found today are 2" wide. These were perfect but had some deformation of the center portion from pulling them, so there was a little wobble when rotating. I went to replace them with new and was told I needed to know the width, which at that time I didn't know.
Fast forward several years where the car has been mostly parked and I am now driving it. I have found that I have a great issue with the rear brakes locking up on gentle stops, never mind panic stops. Pulled the drums today and found no leaks at the cylinders, very good looking linings, rubbing of the drum on the backing plate on the side that locks (maybe locking due to out of round/true condition of the drum?) and some broken hardware on the side opposite of the locking wheel.
I want to start completely new with the rear brakes so as to eliminate any questions with that end of the system.
The PO was a non-mechanic so my paying more attention when I first got the car might have helped, but I have learned that he often did things more wrong that I could, even with me being a GM guy. And he had been all over the brake system, with almost disastrous results.
1 Should I should have 1-3/4" linings and drums or the 2" parts on my car?
2 Are the backing plates specific to the brake width?
3 If so, how can I identify what backing plates I have?
4 is there any way to mod the backing plates/hold downs so I can run 2" parts on 1-3/4" backing plates?
Thank you for any input,
Tom
Working on the rear brakes on my 71 Sportroof. Car was originally a 302-2V with a 3 speed manual and 8" rear. Rear axle was converted to a 9" from a 69 Cougar, but the rear backing plates from the 8" were changed over to the 9". Did this with a sealed system as I had already replaced the rear shoes and cylinders and didn't want to open everything up again.
I replaced rear shoes when I first got the car and do not remember being asked what width I needed, was handed a box and installed them. They are currently 1-3/4" wide.
The drums the car had when I got it were hosed and were exchanged for the drums from the 9" rear end, which I found today are 2" wide. These were perfect but had some deformation of the center portion from pulling them, so there was a little wobble when rotating. I went to replace them with new and was told I needed to know the width, which at that time I didn't know.
Fast forward several years where the car has been mostly parked and I am now driving it. I have found that I have a great issue with the rear brakes locking up on gentle stops, never mind panic stops. Pulled the drums today and found no leaks at the cylinders, very good looking linings, rubbing of the drum on the backing plate on the side that locks (maybe locking due to out of round/true condition of the drum?) and some broken hardware on the side opposite of the locking wheel.
I want to start completely new with the rear brakes so as to eliminate any questions with that end of the system.
The PO was a non-mechanic so my paying more attention when I first got the car might have helped, but I have learned that he often did things more wrong that I could, even with me being a GM guy. And he had been all over the brake system, with almost disastrous results.
1 Should I should have 1-3/4" linings and drums or the 2" parts on my car?
2 Are the backing plates specific to the brake width?
3 If so, how can I identify what backing plates I have?
4 is there any way to mod the backing plates/hold downs so I can run 2" parts on 1-3/4" backing plates?
Thank you for any input,
Tom