I cannot get the air out of my brake lines

COOKIE4169

MEMBER
1995 CHEVROLET ASTRO
150,000 MILES

I have changed the master cylinder twice. I have no brakes at all I have no brake pedal at all I put on new brake lines changed the brakes and changed the master cylinder and I have bled the brakes numerous times and I still have no brakes

Monday, February 20th, 2012 AT 6:12 PM

5 Replies

HMAC300

MECHANIC
48,601 POSTS

The master cylinder when replaced SHOULD be bench bled before installing on the vehicle. Try a power bleeder

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Monday, February 20th, 2012 AT 9:07 PM

COOKIE4169

MEMBER
3 POSTS

Already used a power bleeder and bench bled all of them

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Tuesday, February 21st, 2012 AT 2:15 AM

HMAC300

MECHANIC
48,601 POSTS

Start at right rear, left rear, right front left front. If air is till in system thereis a loose line or connection or bleedervalve not seating.

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Tuesday, February 21st, 2012 AT 2:07 PM

COOKIE4169

MEMBER
3 POSTS

I thought of that too but if the bleeder valve is leaking or the connection is loose wouldnt there be a leak cause I dont see any leaks at all

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Tuesday, February 21st, 2012 AT 6:38 PM

HMAC300

MECHANIC
48,601 POSTS

Not neccessarily, it may be leaking just a tiny bit. I you had brakes before and just replaced the master then either the master is bad or it's got air in it. If you have put new brake lines in by using compression fittings instead of a regular flare with a connector that may very well be your problem.