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Location:
brisbane
Registered:
September 2005
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brake booster not working...
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Wed, 21 September 2005 11:24
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im just wondering how do i check my brake booster to see if working and what not...basically whats happening is i changed fluids, pads and cleaned up the brake pistons before i got my roadworthy, and ever since then ive had alot more travel than usual and it takes alot of effort to get enough force to get some real braking force. i noticed this especially after driving a different car and realised all i should need is light pressure with my heel on the ground, not full force from my whole leg, hence im wondering whats going on...and yes i did bleed the brakes  what can u tell me?
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Location:
Canberra
Registered:
February 2004
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Re: brake booster not working...
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Wed, 21 September 2005 17:43
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If your brake booster is not working then you would expect a really hard pedal that requires a lot of force to pull the car up not a soft pedal. To test your booster operation pump up the brake pedal a good few times until its hard hold the pedal down and then start the car, you should feel the pedal drop a little as the servo kicks in. If this doesnt happen then check your vacuum line from the servo to the inlet manifold.
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Location:
Melbourne
Registered:
May 2002
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Re: brake booster not working...
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Thu, 22 September 2005 00:19
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There should also be a 1 way valve on your booster or inline with the inlet manifold check to see if the operation of that is functional
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Location:
brisbane
Registered:
September 2005
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Re: brake booster not working...
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Thu, 22 September 2005 00:25
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i did wat u said...and the pedal did drop..brake booster working..i spose thats a good thing, wat else might it be thats making my braking such an effort?? 
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Location:
brisbane
Registered:
September 2005
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Re: brake booster not working...
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Thu, 22 September 2005 00:27
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| Fattony wrote on Thu, 22 September 2005 10:19 |
There should also be a 1 way valve on your booster or inline with the inlet manifold check to see if the operation of that is functional
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is that just to see if the booster is working?
any ideas on what it might be?
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Location:
Canberra
Registered:
September 2005
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Re: brake booster not working...
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Thu, 22 September 2005 01:11
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perhaps master cylinder?
front or rear seal in cylinder mayb stuffed now
try bleeding system again! if there's more air you've
got problems
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Location:
brisbane
Registered:
September 2005
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Re: brake booster not working...
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Thu, 22 September 2005 16:12
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didnt bother to bleed as the brakes wernt spongey, i jacked up the rear and the drums were binding grrrr gotta get ridda those drums  anywho adjusted them back and the brakes seem better but there is still alot of play in the padal which i dont wanna adjust out on the drums coz they self adjst themselves and will prob end up binding them selves coz they are evil, what help can u give me?
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Location:
Shailer Park Qld
Registered:
July 2005
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Re: brake booster not working...
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Thu, 22 September 2005 17:13
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i find that when my pads are old, the pedal can go all the way to the floor, and has much less braking force...even at full pressure it wont lock the wheels...maybe the new pads u put in (they are new right?) are thinner than "normal" items...other than that, and the other replies, u sure u bled em completly...with no bubbles left? could be a tiny tiny bubble somewhere creating havoc?
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Location:
Menai area of Sydney
Registered:
June 2003
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Location:
brisbane
Registered:
September 2005
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Re: brake booster not working...
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Fri, 23 September 2005 01:41
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nah the pads are new, and they are just ever so slightly touching when u spin the fronts when they are off the dround, not enough to hinder there progress tho, so im thinkin that they are all sweet
i think i will bleed them again just incase but i dont think its air, FWIW i always bleed them in the right order
i havnt checked but im sure that with the handbrake on theres less travel
scorpion: u seem to know what ur talkin bout with these drums so my question to u is would u recomend using the little adjuster on the back of the drum, or just using the handbrake cable tensioner? and also when i pulled the hubs off, had to hit them with a hammer and watch the brake dust fall out the drums sprung outwards so i readjusted them using the adjust so the hub just went over without any binding, then i adjusted the handbrake so it actually did something effective, its at about 7 clicks, meant to be 4-8 i dunno if this means anything but what can u suggest to me?
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: brake booster not working...
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Fri, 23 September 2005 14:33
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You should make sure you have plenty of slack in the handbrake cable and use the little worm gear adjuster on the back of the drum brakes to make the adjustment. Then take out any excess cable length with the tensioner on the side of the handbrake. Leave it with about 5-7 clicks of movement. If you hold the button in and pull on the handbrake you can get an idea where the handbrake handle will be when the hanbrake startds to bite.
Sometimes you can get a closer adjustment after you have slid the drums back on. If the drums are worn, there will be a lip aroundthe inside edged where the pads don't reach. If you don't have a lip then what you have done sounds about right. Not unusual to have dust come out when you hit the drums with a hammer. I use a long-bristled paint brush to nrush a lot of the excess dust out of the brakes when I clean them up. Also chak for any dampness around the brake slave cylinders as this could indicate a problem inthe making.
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Location:
brisbane
Registered:
September 2005
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Re: brake booster not working...
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Fri, 23 September 2005 14:56
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ok ill adjust them when i get time, but the adjuster is an ass to get to  any tricks u know to make it a bit easier with the drum on?
i dont think they are worn, ill double check but im fairly sure they wernt, surprising for a 400 000 km car.
would u say its unusual to get a small mound of dust from each drum when i took it off when the shoes were new and the drum was perfectly clean only 4 month ago, only about 500 km of drivin since then, thats why i was disturbed, but they were binding i know that much coz i couldnt turn the wheel by hand, got the drum off and she went fine.
slave cylinder the thingy at the top of the brakes which pushes the shoes? what the brake fluid comes into, is thats what ur talkin bout they were new 4 months ago too, old ones were leaking like a sieve
well ill try adjusting them again some time and ill let u know how i go, any more help u can give me would be greatly appreciated
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Location:
Bottom of the hill, Sydney
Registered:
April 2004
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Re: brake booster not working...
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Fri, 23 September 2005 23:26
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Did you bed in the new pads?
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Location:
brisbane
Registered:
September 2005
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Re: brake booster not working...
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Sat, 24 September 2005 03:11
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how do u bed in drums shoes?
they just go on and u adjust them right??
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Location:
Bottom of the hill, Sydney
Registered:
April 2004
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Re: brake booster not working...
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Sat, 24 September 2005 08:06
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It says in your first post
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i changed fluids, pads and cleaned up the brake pistons
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If it was brake shoes that you fitted then ignore my first post  .
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Location:
Menai area of Sydney
Registered:
June 2003
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Location:
brisbane
Registered:
September 2005
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Re: brake booster not working...
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Sat, 24 September 2005 12:37
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Brad: i changed front and rears, i did bed the front pads in.
thanx scorpion, would u expect the leading shoe to about half its original thickness, coz thats what its done, they were definately binding, but i think ive fixed that and the brakes are seeming better now, just a bit long, ill try ur idea for making adjustments aeasier, thanx mate
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Location:
Menai area of Sydney
Registered:
June 2003
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Re: brake booster not working...
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Sat, 24 September 2005 12:41
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Normally front shoe will wear more than rear shoe.
Are you sur youve only done 500Km on them for them to be half worn ?
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Location:
brisbane
Registered:
September 2005
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Re: brake booster not working...
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Sat, 24 September 2005 13:25
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yeah man, they were binding tight, like couldnt turn the wheel by hand tight, i know ive done 500 coz ive gone thru 2 tanks and ive only been gettin 250 km to a tank, which even now they arnt bindin my economy dont seem much better 
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