C4 Tech/Performance L98 Corvette and LT1 Corvette Technical Info, Internal Engine, External Engine

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Old Dec 7, 2011 | 09:56 PM
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az-Thom
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84 corvette, 10100 miles. off and on the brakes are hard when I start the car. After a min or so they are normal. What's wrong? Oh by the way , the rear reservoir needs to be filled often although I haven't found any leaks. Your thoughts
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Old Dec 8, 2011 | 12:20 AM
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The brake fluid is probably leaking from the rear seal in the master & ending up in the brake booster.

Check the vacuum hose to the booster it may be deteriorated on the inside & not supplying enough vacuum to the booster.
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Old Dec 8, 2011 | 12:51 AM
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thanks Churchkey.
If the master cylinder has leaked into the booster do I need to replace the booster? I'll check for that vacuum leak tomorrow.
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Old Dec 8, 2011 | 08:54 AM
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Originally Posted by az-Thom
thanks Churchkey.
If the master cylinder has leaked into the booster do I need to replace the booster? I'll check for that vacuum leak tomorrow.
In most cases booster & PCV hoses deteriorate from the inside.

If the hose is bad replace it & see if the booster will work ok.

If the hose is ok its time for a booster & master.
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Old Dec 8, 2011 | 02:04 PM
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thanks for the advice. i'll check those out.
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