Offroad-Express

got a problem with my brakes looking for help/advice......

when i push the pedal down sometimes the brakes are good and others shocking and feels like it wont stop. very firm pedal always, never spongy, i have bled the brakes tonight with only a very small amount of air coming out, made no difference. took the vacuum pipe off the servo and vacuum is fine. rotors and pads all seem good.


so any ideas please??

do your wheels free spin pitons can bind on or sieze

muskie wrote:got a problem with my brakes looking for help/advice......

when i push the pedal down sometimes the brakes are good and others shocking and feels like it wont stop. very firm pedal always, never spongy, i have bled the brakes tonight with only a very small amount of air coming out, made no difference. took the vacuum pipe off the servo and vacuum is fine. rotors and pads all seem good.


so any ideas please??

I know whats wrong cause it happened to mine after replacing all pads, discs, calaper(spelling) pistons, some brake lines, master cylinder it turned out to be the vaucum part on the back of the altinator and yes if you check it the vaucum will be fine so if you have a spare one lying around replace it and give it a go its a damm site cheaper then $2500 it cost me to figure out it was a part that I had a spare under the bench

or you can pull the alternator off and get it reconditioned by a autosparky

Jerry wrote:or you can pull the alternator off and get it reconditioned by a autosparky

tryed that with Bubbles truck and it didnt work so we just got the vacum piece of a mates and that worked its somthing to do with the spline

If not that I had the exact same symtoms but I also had brake fluid leaking out of the master cylinder. Master cylinder needed reboring and sleved with new seals, Brakes are really good now even with 35s.

muskie wrote:got a problem with my brakes looking for help/advice......

when i push the pedal down sometimes the brakes are good and others shocking and feels like it wont stop. very firm pedal always, never spongy, i have bled the brakes tonight with only a very small amount of air coming out, made no difference. took the vacuum pipe off the servo and vacuum is fine. rotors and pads all seem good.


so any ideas please??

i had the same problem in my surf and ended up replacing the rubber brake hoses, stops good now

thankyou guys

well i think i will try the vacuum part on the rear of the alternator first, found a used one a mate had for $150, wreckers wanted $350 which i am struggling to believe. what a pack of total theives

i cant see any leaks, but its becomming a more frequent occurance, when i start the truck the brake pedal doesnt go down very much so would indicate a vacuum problem, however the suck on the vacuum pipe seems good?? the brakes are nowhere near as good as my everyday safari.

pr you were right, thanks for that........ i rang the previous owner today and he said the brakes went a bit odd when he put the new alternator on, when he asked at the auto sparks they said its nothing to do with it... to cut a long story short there are 2 different types of vacuum pump, a big one and small one i had the small one on, changed it today and the brakes are the same as my other truck now. there is a clear difference in physical size of the pump, small is 30mm width and big one is 50mm.

Good to here you have the problem soughted and it didn't cost you much