It has vacuum assist brake set up on it and just recently you step on the brakes and lose vacuum ive checked for leaks as far as putting a vacuum pump on it and it held the same pressure all night any other ideas back brakes r new fronts r bad but getting replaced tomorrow
2006-09-25 17:20:03 · 6 answers · asked by rusty3676 1 in Cars & Transportation ➔ Maintenance & Repairs
Hold your foot on the brakes with the pedal fully depressed. If you hear air leaking then the booster is shot and needs to be replaced. (vehicle has to be running)
2006-10-02 11:02:37 · answer #1 · answered by Anonymous · 0⤊ 0⤋
Have someone step on the brakes when the air pressure is at max and the you hear the pressure relief valve blow off. Walk around the vehicle and listen for air leaks around behind the wheels. One of the round brake chambers may be leaking. You'll hear it if it is. Get it replaced by someone who knows what they are doing. If you take it apart and don't know what your doing there is a cage spring under tremendous force inside the chamber that if it isn't removed right can literally kill you!
If you don't hear any leaks at the chamber, Then more than likely its the pedal assy leaking in the box the brake pedal is connected to. If this is an air over hydraulic system then you won't have brake chambers at the wheels. The problem is in the air over hydraulic pedal assy.
2006-10-01 11:45:44 · answer #2 · answered by whtsthislif4 5 · 0⤊ 1⤋
the vacuum assist may have a leak in the internal diaphragm and until the pedal is pressed it may hold pressure try checking the vacuum at idle before and after pressing the brake at the vacuum connection going to the break booster
2006-09-26 00:29:19 · answer #3 · answered by yodamandemonoid 3 · 0⤊ 0⤋
check to see if its making vacumn itself,what engine does it have?If its petrol/gas it gets its vacumn from the inlet manifold but if diesel which doesnt make vacumn,there will be an exhauster(vacumn pump).check that for operation.
if none of the above it will be the diaphram or valve in the booster..
2006-09-26 04:41:44 · answer #4 · answered by frank m 5 · 0⤊ 0⤋
I agree with the above answer, the diaphram probably has a crack in it that only leaks when the diaphram is moved.
2006-09-26 00:32:48 · answer #5 · answered by Gordon S 5 · 0⤊ 0⤋
Check for blocking, if they are that's all i can think of for now. If they are hydraulic, also check for blocking and check for fluid leak, check for kink in lines and bubbles, check the seals and of that's not it then i am sorry to have waisted your time.
2006-09-26 00:33:31 · answer #6 · answered by Anonymous · 0⤊ 0⤋