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brake booster 

 

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 Post subject: brake booster
Posted: Sat Nov 27, 2010 1:20 pm 
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ive put in a new master cylinder, bleed the brakes and now ive no pressure even with the engine running. my ! warning light is on for hydralic failure. my guess is the booster is kaaput.

does anyone else have any other answers to my situation

 

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 Post subject: Re: brake booster
Posted: Sat Nov 27, 2010 1:31 pm 
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when you say no pressure, do you mean no pedal pressure??
if the brake pedal is rock hard with the engine running booster is not working..
if the pedal goes to the floor its a master cyl or air in the system problem.. maybe there is an air lock in the line or master cyl...????
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 Post subject: Re: brake booster
Posted: Sat Nov 27, 2010 2:06 pm 
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yep the pedal goes to the floor. il keep investigating the problem 2moro. to hot right now

 

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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 1:32 pm 
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ive just gone over the brakes again.

the hydralic failure light has gone off but ive still got no pedal pressure meaning the pedal is going to the floor no matter how many times i get the missus to pump it.

the booster was fine before a changed the master cylinder so im thinking more a vacuum leak but i cant hear any hissing type of noise

any more ideas

 

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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 1:41 pm 
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if the booster is buggered or you have a vacuum leak the pedal will be rock hard. it has to be a hydraulic problem. did you bench bleed the master cylinder before you fitted it?

 

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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 1:52 pm 
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is it a brand new master cyl or a "new" second hand one??
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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 2:00 pm 
Tyre Shredder
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its off my other falcon which died

 

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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 2:08 pm 
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keep bleeding.

 

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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 2:09 pm 
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there is a chance the the master cyl has failed,
i myself have taken working second hand ones of wrecks to have them fail as soon as air entered the system...
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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 2:10 pm 
Getting Side Ways
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oh. well maybe the insides were full of scale and rust and you bleeding it forced the piston passed it's normal travel into the rust and scale and damaged the seals. seen it happen before

 

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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 2:11 pm 
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ive bled about 600ml through the thing with no change in pedal pressure.

the lines arent cracked the calipers dont leak its just a pain in the a**

 

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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 2:12 pm 
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mendyxr6 wrote:
ive bled about 600ml through the thing with no change in pedal pressure.

the lines arent cracked the calipers dont leak its just a pain in the a**


do you get a nice strong stream of brake fluid through ALL bleed nipples?

 

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Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 2:13 pm 
Tyre Shredder
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whats a brand new one cost roughly. might just go do that

 

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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 2:13 pm 
Getting Side Ways
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like 200ish

 

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Weekend driver: EA SVO AU motor. Built BTR. TCE 2800 stall. T76 turbo. Locked diff. On E85. approx 320rwkw. 11.5 @121mph

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 Post subject: Re: brake booster
Posted: Sun Nov 28, 2010 2:16 pm 
Tyre Shredder
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when bleeding it flows nice an easy. il try bleeding it somemorejust for the off chance it might sort itself out

 

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