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[C2] Having a 67 brake problem

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Old Apr 3, 2018 | 09:50 PM
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Default Having a 67 brake problem

I’m wondering if the power brake booster is shot on my 67. There’s no initial “bite” when I hit the brakes, and it’s very hard to lock the brakes. I thought maybe the pads and discs were glazed, but today I put on new pads and had the rotors sanded and nothing changed. Possibly old age is a factor, but I’m also wondering if the power brake booster maybe has an internal leak. There’s no evidence of a leak in the vacuum hose between the intake and the booster. I’ve had the car since 2002 but it’s my first Sting Ray with PB and so I have no experience troubleshooting it.

Autocross season begins in two weeks, and I’m used to slowing down fast by keeping the brakes just at the point of lockup --- except now I can’t lock ’em up.

I see that new boosters are about $200, but what I don’t know is how troublesome it is to swap out the old one and swap in the new one. Do I have to worry about pushrod lengths? Brackets? Gaskets? Do all the vendors sell the same unit, as appears to be the case, or is one vendor better?

Thanks for the help!

Lou
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Old Apr 4, 2018 | 04:11 PM
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start the engine so that you have vacuum in the booster. Stop the engine, press the brake pedal on and off a number of times. You should gradually feel the pedal become harder as you use up the vacuum stored in the booster.
I assume you checked the master cylinder fluid level?
When is the last time you bled the brake calipers in the correct sequence?
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Old Apr 4, 2018 | 05:49 PM
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Is the check valve on the boost cylinder still holding vacuum?
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Old Apr 4, 2018 | 08:06 PM
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Thanks for the suggestions. I did have it checked out by my usual mechanic and it gets a new booster next week.

Lou
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