Low Brake

[shoe48]

Low Brake with new Master Cyl . Bled it out real good till new fluid all four corners , Can Block off the lines and get a hard Brake using vise grips .. Any ideas ?

[jonmark1985]

You may have a leaking line or hose somewhere.

[mark v]

Did you bench bleed the new Master cylinder?

Bleeding brakes.....
Start at right rear, left rear, right front and finish at the left front.

If you did all of this you have a bad leak or air in the lines.

[shoe48]

Done all that and no leaks at all .. abs cause this ?

[mark v]

No ABS wont cause this unless the ABS is leaking.

OK I think I see what is wrong. Your calipers and wheel cylinders will move when you press the brake, this will cause a low pedal, it will never be high. If you block all the lines the brake fluid will go nowhere and try to compress and give an instant hard pedal that is high.

You have no problems. Put it all back together and you will be fine.

This is normal symptoms you are getting. I just did my brakes this summer and your post just triggered my memory of the pedal feeling low.

[goon]

do you have drum brakes at the back. if you do make sure they are adjusted up you want alittle drag on the rear drums.

[shoe48]

I know about to much travel in the rear ,, Thanks for the reply

[GraybeardAv]

Aren't the rears self-adjusting?

[goon]

yes they are but they do not always work very will!!!!!!!!!!!!!!!!

[mark v]

Did you even read this post?

Originally Posted by mark v

No ABS wont cause this unless the ABS is leaking.

OK I think I see what is wrong. Your calipers and wheel cylinders will move when you press the brake, this will cause a low pedal, it will never be high. If you block all the lines the brake fluid will go nowhere and try to compress and give an instant hard pedal that is high.

You have no problems. Put it all back together and you will be fine.

This is normal symptoms you are getting. I just did my brakes this summer and your post just triggered my memory of the pedal feeling low.