Bleeding Brakes - Team Camaro Tech
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post #1 of 42 (permalink) Old Feb 9th, 20, 10:25 AM Thread Starter
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Bleeding Brakes

Just changed the master cylinder in my 68SS. Bench bled the MC, front dusk bled fine, cannot get any fluid out of the drum rears. Have read where the proportioning valve may have activated. Any thoughts? Is it possible to re center the proportioning valve?

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post #2 of 42 (permalink) Old Feb 9th, 20, 09:19 PM
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Re: Bleeding Brakes

You have most likely "triggered" the proportioning valve. When bleeding brakes it is recommended to start at the wheel furthest from the master cylinder. On the first gen Camaro that would be the right rear. I think you need to open the front bleeders and push the brake pedal to rest=et the valve but it's been so long since I've had to reset one I'm not sure.

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post #3 of 42 (permalink) Old Feb 10th, 20, 06:25 AM
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Re: Bleeding Brakes

Get a test light. Hook the roach clip to the +side of battery, touch the tip of the warning switch. If the test light, lights up...valve is tripped.
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post #4 of 42 (permalink) Old Feb 10th, 20, 07:02 AM
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Re: Bleeding Brakes

Yes, the valve can be reset. Look at the front end of valve for the center protrusion.
Normal length sticking out, test light and/or BRAKE is off. If stem is sunk into valve, open a front cylinder and have assistant press hard & fast on brake pedal and hold to floor. Close bleeder, release pedal.
Do the same procedure if stem is sticking out, except open rear cylinder and press hard & fast, hold pedal and close bleeder.

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post #5 of 42 (permalink) Old Feb 10th, 20, 07:16 AM Thread Starter
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Re: Bleeding Brakes

I have a brake line connection coming off the front end of my proportioner so there is no provision sticking out.
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post #6 of 42 (permalink) Old Feb 10th, 20, 09:28 AM
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Re: Bleeding Brakes

I assume you guys are talking about the distribution block, which sits below the MC and has a wire for the brake warning light. It doesn't block fluid flowwhen tripped - it just operates the warning light switch.

The proportioning valve - if so equipped - mounts on the driver's side rail of the subframe, approx below the driver's seat.

1st suspect for no fluid to rears would be an internally collapsed flex line to the rear axle, assuming new MC was properly bench bled. Could also be rust and crud in the wheel cylinders.


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post #7 of 42 (permalink) Old Feb 10th, 20, 09:57 AM Thread Starter
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Re: Bleeding Brakes

Would the proportioning valve stop fluid flow?
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post #8 of 42 (permalink) Old Feb 10th, 20, 11:35 AM Thread Starter
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Re: Bleeding Brakes

I checked under the drivers seat area on the frame. There is a very small junction block that the drivers side rear brake line comes in and out of. I do have a device that bolts on the vacuum housing. The front line from the MC goes to it then it goes to the distribution block. Could this be the proportioning valve? If so how do you reset it?

Thanks
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post #9 of 42 (permalink) Old Feb 10th, 20, 11:45 AM Thread Starter
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Re: Bleeding Brakes

Looking at a video I have the MC, Distribution Block and Metering Valve. It does not look like I have a proportioning valve on the frame rail. Does this make any sense?

Thanks
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post #10 of 42 (permalink) Old Feb 10th, 20, 02:07 PM
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Re: Bleeding Brakes

From what I read only 68's that came equipped with a 12 bolt rear got the valve on the frame rail from the factory. Why did you change the Master Cylinder? What issue did the car have?

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post #11 of 42 (permalink) Old Feb 10th, 20, 03:27 PM Thread Starter
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Re: Bleeding Brakes

The MC was leaking, it appears over time moisture had caused som rust
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post #12 of 42 (permalink) Old Feb 10th, 20, 07:28 PM
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Re: Bleeding Brakes

Some info on Camaro brake systems:
Camaro Brake Valves

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post #13 of 42 (permalink) Old Feb 11th, 20, 10:34 AM Thread Starter
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Re: Bleeding Brakes

Thx
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post #14 of 42 (permalink) Old Feb 11th, 20, 03:07 PM
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Re: Bleeding Brakes

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post #15 of 42 (permalink) Old Feb 11th, 20, 05:00 PM
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Re: Bleeding Brakes

Post #11. He found the problem already

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