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Author Topic:   Rear Brake Help
C2W
Dirt Full Roller

Total posts: 70
posted September 02, 2004 09:34 AM  
I have an 81 Monte Carlo Pure stock that is having some major brake problems. The first problem was fixed with a new brake booster (off old car). The pedal was sticking when the car was running. We still have no rear brakes. We have bled them and bled them and still have no results. We took the whole rear end out from under our old car, so they were working then. We know we are getting fluid to the little block on the rear end, but it is not getting into the brakes. We have taken the bleeders all the way out and pumped and pumped with no results. I am planning on racing this weekend either with 2 or 4 brakes, but I prefer 4. Any help would be greatly appreciated. Thanks in advance.

jay116
Dirt Freak

Total posts: 428
posted September 02, 2004 10:22 AM  
I'm not sure what little block you're refering to, but try this: disconect the lines at that point and use a large C clamp to push the pistons back in on the calipers. This will force fluid backward through the lines and should blow out any debris in them. (leave the bleaders in when you do this.) good luck

racer17j
Dirt Forum Champ
Total posts: 5390
posted September 02, 2004 09:07 PM  
It has drum brakes on it. I have another car to take the lines off. They were good when I ran them last year. I just needed to know if this could be the problem before I went through the trouble of changing them. I will try this and see how it works. By the way, the block I am referring to is a little small square block that the single line runs into. The lines go from the block to the wheel. Thanks for the help.

racer17j
Dirt Forum Champ
Total posts: 5390
posted September 03, 2004 03:15 PM  
If I was you before I went and replaced all the lines, I would leave all the lines connected up and open one bleeder on the wheel cylinder and hook a brake bleeder vacuum pump to it and see if you get fluid to come out. Just make sure that you keep the master cylinder full, so that you don't pull air into the system. This way you can pull all of the old fluid out of the whole system and replace it with new fluid, from master cylinder to the rear wheel cylinders. I do this to my car after every season and it help to keep you brake trouble free.

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iowatoolman
Dirt Freak

Total posts: 369
posted September 04, 2004 12:25 AM  
are you using the factory proportioning valve if so it sounds like it needs reset or you can take it out

drive hard or drive home

Eljojo
Dirt Forum Champ
Total posts: 968
posted September 04, 2004 06:04 AM  
You have a flexable line that goes from under the rear of the car to the brake line tee on the differential. Without pressure on that line (ie bleeder open) fluid will freely pass. Under pressure the inner lining in that line is collapsing, causing a blockage, and not allowing fluid to flow.

Occasionally you will see this occur on the front brakes too. You'll go nuts because the car will pull sharply to the right when the left side line fails.

C2W
Dirt Full Roller

Total posts: 70
posted September 06, 2004 06:55 PM  
Well, we have 2 weeks to get the brake problem fixed. We came from 18th to 2nd in the feature only to be dq'd at tech for illegal springs. Hopefully we will get all the brake stuff replaced while we serve our suspension. Thanks for all of you guys help, even with the spring advice.

[This message has been edited by C2W (edited September 06, 2004).]

Ego Racing
Dirt Forum Champ
Total posts: 724
posted September 08, 2004 04:12 PM  
Is it a new or old master cylinder? I have seen a master cylinder that would pump fluid not do anything when it had back pressure. Take the right rear (longest line) off of the wheel cylinder and check for fluid flow. If if is good connect it to a new wheel cylinder and put the cylinder in a c-clamp and just let the clamp touch the cylinder pistons then hit the brakes, the cylinder should lock the c-clamp up and you can feel the pressure if you unscrew the clamp while holding pressure on it.

ruggs66
Dirt Maniac

Total posts: 193
posted September 09, 2004 12:00 AM  
that happened to me once & I had to bleed the left front, then the right rear & then the left front & then the left rear.... yes I kept bleeding the left front then did the rear brakes... who really cares about the right front! LOL

I guess the proportioning valve does get screwed up sometimes & this way of bleeding the brakes worked for us.

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