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Old 03-28-2005, 20:10   #1 (permalink)
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Question EF RPS High, Hissy Brakes

Hey Guys,

My EF 94' has developed some issues.....here we go:

1. RPM sits at 1000 RPM and differs a little bit (just fly shit unstable)

2. Brakes "Hiss" when the car is still and brakes are depressed.

Im thinking that the MAster brake cylinder is lossing vacume pressure and in which case the car is idle'ing faster to keep the preesure up

Sound reasonable ?
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Old 03-28-2005, 22:13   #2 (permalink)
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Re: EF RPS High, Hissy Brakes

Sounds like the hose from the inlet manifold is split or damaged or possibly the mastercylinder booster is shot; any chance you can stick your head under the bonnet to listen and feel the hoses etc? sometimes a can of CRC / WD40 stuff is good to check for leaky manifolds etc
Don't play around with brakes though make sure to get it fixed incase its the mastercylinder about to fail
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Old 03-29-2005, 23:09   #3 (permalink)
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Re: EF RPS High, Hissy Brakes

To check if the brake booster is working OK and that it's getting adequate vacuum and that there are no leaks, do this. With the engine off, pump the brakes a few times to exhaust any vacuum from the booster. (The boosters hold a bit of vacuum for emergency braking if the engine stops while driving). After you've done this the pedal should become quite hard. Then, while holding your foot firmly on the brake pedal, start the engine. Your foot should slowly sink a bit and then stop. If it does this, the booster is probably OK. If you have a continuous hissing sound, there is most likely a vacuum leak somewhere. Get a piece of plastic hose, put one end to your ear and go looking for a leak with the other end around the brake booster hose and fittings. You'll find it! And a leak WILL trash your idle!
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