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no brake pressure at rear brakes help

G

GT350

Member
i have a new master cyl all new lines/hoses etc on a 68 mustang problem is i cant get any brake fluid or any pressure at all at the rear brakes,the front brakes bled ok but zero fluid at the rear.
 
Disconnect line at both ends and blow some pressurized air through the line. What about a blocked proportion valve? Did you bench bleed the MC?
 
"silverblueBP" said:
Disconnect line at both ends and blow some pressurized air through the line. What about a blocked proportion valve? Did you bench bleed the MC?
Click to expand...
yes i did i bled it again on the car there was very little pressure coming from master cyl just a trickle,could i have a bad master cyl?
 
Let me ramble. Front fine, no pressure to rear. Could be master cylinder, leak somewhere in the rear line, prop valve... Have you checked the rear line before it splits? Rear disc or drum? If drum is there a chance a wheel cylinder is leaking? As Mark mentioned have you tried passing air through the rear line?
 
"blue65coupe" said:
Let me ramble. Front fine, no pressure to rear. Could be master cylinder, leak somewhere in the rear line, prop valve... Have you checked the rear line before it splits? Rear disc or drum? If drum is there a chance a wheel cylinder is leaking? As Mark mentioned have you tried passing air through the rear line?
Click to expand...
all the rear lines are bone dry and i have new rear wheel cyls,rears are drum.Not tried passing air through the line
 
Do you have an inline proportioning valve? If so make sure it is open. You can also run a rubber line coming out of your rear port on your mc back into the mc to see if it's pushing fluid. Odd that the rear line is completely dry.
 
"blue65coupe" said:
Distribution block good?
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dist block is good its a new unit ,while i was bench bleeding the master cyl earlier today i noticed lack of pressure from the rear bowl just a dribble coming out,so thats got me thinking i have a bad master cyl
 
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