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Author Topic:   Brakes
Scoot
Member
posted March 27, 2004 12:37 AM
I run 3 wheel brakes, disc on the front, drum on the back for now. Tonight in my heat race and feature race the left front was dragging very very badly. What would cause this? Brand new caliper, brand new master cylinder for a 69 chevy truck. The right front is closed off at the stock proportioning block. Could that be part of my problem? To much pressure just on that one side? I didnt have that problem last year, but I had it blocked off at the right front caliper. The only thing I know to do is replace the rubber line the caliper. I just dont understand why it wont release. One more thing, where can I get lighter weight front rotors for an 80 camaro?

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Scoot
Smith Racing Team
870-365-5989

[This message has been edited by Scoot (edited March 27, 2004).]

way2fast72
Member
posted March 27, 2004 12:54 AM
scoot,make sure the push rod on your master cylinder is returning all the way.If it dosent,every time you apply the brake it wont let the pressure bleed off and eventually will drag or lock the brake,after the car sits a while it will bleed off and the wheel will spin free.jack it up and apply the brake a few times and see if you can turn the wheel,if not the rod may be to long.hope this makes sense.


Scoot
Member
posted March 27, 2004 01:07 AM
I cut the brake rod off alot because I thought that was causing a problem with me getting my rear brakes bled. So its plenty short. But I will double check that it is returning by itself.

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Scoot
Smith Racing Team
870-365-5989


way2fast72
Member
posted March 27, 2004 05:55 AM
scoot,could also have a caliper sticking if the master cylinder all seems ok.


Donnie Ross
Member
posted March 27, 2004 06:25 AM
scoot did you put on new flex lines to the caliper?stock type will flake off a piece of rubber sometimes acts like a one way check valve this sounds possible from your description, had it happen many times on street vehicles in our shop.


Scoot
Member
posted March 27, 2004 08:23 AM
Thanks for all your ideas, I plan on buying a new flex line today and see if that will cure the problem. Its the only thing besides the stock proportioning valve that isnt new.

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Scoot
Smith Racing Team
870-365-5989


PEDDLER
Member
posted March 28, 2004 06:25 AM
The prob may be the valve. Do away with it. Also are you running a dual master cyl or an old single? If your running a single like for drum brakes the the risidual valve in the cyl needs to be removed.

[This message has been edited by PEDDLER (edited March 28, 2004).]

Scoot
Member
posted March 28, 2004 11:48 AM
What I'm running is a master cylinder for a 69 chevy truck that has two resevoirs, for disc and drum. It runs from the master cylinder to the proportioning block, or atleast thats what I assume it is. All four brakes run into it.

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Scoot
Smith Racing Team
870-365-5989


PEDDLER
Member
posted March 28, 2004 08:01 PM
Personally I would remove the proportional valve and feed the wheels direct fron the Master.


eaton89
Member
posted March 28, 2004 09:25 PM
I pull the o-rings from the bolt holes and polish the bolts so the caliper cant get hung up. Dont know if this is your problem but may help someone.


Scoot
Member
posted March 29, 2004 06:11 AM
Peddler I've thought of doing that but dont they need some type of valve to keep pressure to the rear drums?

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Scoot
Smith Racing Team
870-365-5989


WesternAuto17
Member
posted March 29, 2004 09:11 AM
What is the function of the o-rings in the bolt holes anyway?


PEDDLER
Member
posted March 29, 2004 06:02 PM
Run the rear brakes straight, put a 1/8th pop rivit in the brake line for the left front (without the nail) and that will restrict it enough, or cut part of the pad away.


joetaylor
Member
posted March 29, 2004 06:19 PM
western I am shocked the o rings are to keep the caliper from rattling on street cars I leave them in polish the bolts and use diletric compound for lube and I don't have a problem

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U LIFT U LOOSE


Scoot
Member
posted March 30, 2004 06:02 AM
PEDDLER I dont run a right front brake, should I run it direct to the master cylinder? I know the rear will screw right into the master cylinder, but I believe the front is a different size? Just find a fitting to adapt it?

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Scoot
Smith Racing Team
870-365-5989


PEDDLER
Member
posted March 30, 2004 10:11 AM
I meant the left front and yes just find an adapter fitting.


Scoot
Member
posted March 30, 2004 04:09 PM
Peddler, just wanna make sure I understand you. I do need to cut down on the pressure to the left front right? I'll be putting it all back together tonight and just wanted to clarify what I thought you were saying.

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Scoot
Smith Racing Team
870-365-5989


PEDDLER
Member
posted March 30, 2004 05:11 PM
Good Luck Scoot.


PEDDLER
Member
posted March 30, 2004 05:13 PM
Good Luck Scoot.

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RACING IS A HOBBY
GO HAVE FUN

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