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putting the brakes on makes the car run harder
Posted: Sat May 02, 2009 6:03 pm
by horrydog
hi all
i have a problem with the fb, when i use the brakes the engine rev's more. it happens even if the choke isnt out, the car is idle.
help
please
Posted: Sat May 02, 2009 6:13 pm
by Cal
Unless your car has a brake booster, what you're saying is impossible
Posted: Sun May 03, 2009 12:43 am
by my70wg
brake pedal causes engine to rev harder.
Posted: Sun May 03, 2009 8:34 am
by horrydog
i know it sounds like i may have been drinking, but i kid you not.
we are still using the drum brake system, i am not sure about the brake booster's?
you know i had to muster the courage up to post this as it sounds like i am just making it up, but i have other people who have seen and heard it for themselves.
i think a visit ti Dr Terry maybe required.
when you own cars like this i reckon anything is possible hee hee
Posted: Sun May 03, 2009 5:56 pm
by FB MAD
Follow the steel brake line from the brake master cylinder on the firewall.If it joins a round steel drum like thing in the drivers side of the engine bay about 9 inches diamemter with another brake cylinder attached to it then you have a brake booster.It may or may not have the letters PBR written on it somewhere depending on what model booster it is.
It is possible that ( if you are running a brake booster that is ) you may
have a perforated vacuum diaphragm in the booster which is allowing the the inlet manifold to suck air via the vaccum supply line from inlet manifold to booster at stages of brake operation.You can test this by disconnecting the vacuum supply line from the inlet manifold and block the end of the hose off with something.Then try brake application.
If the engine idle is unaffected then it is possible the fault may be in the booster.
I have an EK sedan here with a VH 40 brake booster that does the same thing during application of the brakes although it's not a currently driving car and I haven't done any investigation myself as to the actual cause of the problem, I have theorised that it may have a perforated diaphragm.
It's hard to diagnose problems without looking at the car and even harder to write a way of explaining how to check things.
I'd certainly be taking it to Dr Terry's shop, he'll find the cause of it for sure.
brake booster
Posted: Mon May 04, 2009 9:25 am
by horrydog
thank you, i was told yesterday it was the brake booster.
good spot fb mad and cal and thanks for posting replies
Posted: Mon May 04, 2009 10:04 pm
by Thommo
Onya Terry
