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Old 06-07-2004, 06:59 PM
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No Brake Pressure....help

ok i just bled the brakes doing the tube in the bottle thing......no air anywhere as far as im concerned....then i bled the master cylinder by holding down the break and cracking the lines......still not enough pedal pressure.........i just replaced the brake booster and the master cylinder, but i susupect that it is the master cylinder......they gave it to me with ports that were too large for my lines....and they also gave me adapters so my lines would fit into the larger ports......could that be the problem??.......any comments or suggestions would be greatly appreciated as usuall.thanks

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Old 06-07-2004, 07:11 PM
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Did you install power brakes.
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Old 06-07-2004, 10:37 PM
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i believe so....

im assuming so.....unless theres a master cylinder for power brakes and non power brakes...????
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Old 06-08-2004, 12:45 AM
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no brakes

just because its new dont mean its good Ive gotten 4 in a row that were bad right out of the box re man sucks but we cant always buy new
does it gravity bleed?
you could also have a swelled rubber flex line
Ive also seen a flex line that had a tear in it that acted like a check valve
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Old 06-08-2004, 08:01 AM
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Did you bench bleed the master cyl before you put it on?
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Old 06-08-2004, 10:59 AM
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yes i bled everything including bench bleeding the master cylinder.......but the thing is that when the engine is off and theres no vacuum in the booster........there is very good brakes pressure.........but when i start the engine.......there is virtually no brake pressure.........any thoughts?
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Old 06-08-2004, 04:13 PM
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no brakes

1 not enough vacuum need a pump or a tank
2bad booster
3 need a check valve on the line
4 i once lost the rubber in between the master & booster it suck to the master and returned the core stupid me had to buy a new booster
5 is the vacuum for the booster getting enough flow?
good luck
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Old 06-08-2004, 07:36 PM
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When you say that you have good pressure with the engine off, are you talking about good brake pressure, or pedal pressure? A hard pedal with the engine off doesn't mean that the brakes work. A bad booster can cause a hard pedal with the engine running, when there are no brakes. The booster reduces the amount of foot pressure required to apply the brakes.

I would suspect that there is either air in the system, or you have a bad master cyl. I would suggest going thru the bench bleeding process again. It can be done on the car by disconnecting the lines to it. If that doesn't work, try another one.
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Old 06-08-2004, 11:28 PM
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ok so if i bench bleed the master cylinder again and bleed the brakes again......and still no brake pressure..........then is there any way i can check if its a bad master cylinder?
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Old 06-09-2004, 09:03 PM
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#%@ ford brake

what r we working on what year n stuff/

they should give u the bleed kit w/ the master when u bench it r there bubbles coming up in side the master if there is constantly then its likely to be bad
also have you test driven it ?
does it pull left? right?
front ? back? gimme more info please
does it have a weep hole on the bottom ?
if yes is it leaking?
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Old 06-09-2004, 09:16 PM
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Steve-0321,

I guess I am missing something.
When you say you have no brake pressure do you mean the pedal goes to the floor but the wheels still turn? Or do you have a gauge on the system and you can read a pressure?

I replaced the same items on my 76 Sprint and I had very little brake pedal. I had brakes but only when I got to the floor board.
It turned out that I had to pressure bleed the system and TA-DA I had good pedal and great stopping power. See if you can borrow a pressure bleeder from the parts store.

Scholman
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Old 06-09-2004, 09:25 PM
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brakes

a typical hydraulic brake system should be free flowing
meaning that if you take the cap off the master and loosen the bleeder it should run right out ,this is called gravity bleeding.
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Old 06-11-2004, 01:19 AM
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its a 73 mustang.......power discs......rear drums.........theres just not as much pedal resistance there was before i replaced the master cylinder.......i bled the MC and im sure there isnt air in there..........and as far as the brake are concerned i bled them the best i could.......so im stumped......
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Old 06-12-2004, 07:48 PM
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flex hose

2 in the front 1 in the rear how old are these flex line is it possible that u kinked or squasher a steel line?
i had tha fitting prob w/ myb 79 p-u w/ that 3/16 line and who knows what size the tread is try anouthe new master or rebuild might have gotten dirt in there or loosened some old dirt last ditch effort try thr proportion valve god luck
ill keep checking till ya get it right
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Old 06-12-2004, 09:17 PM
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brakes

did youcheck the condition of the rear shoes?
and adjust them up?
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