brake bleeding sequence
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Joined: Jul 2007
Posts: 99
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From: Iowa Park TX
brake bleeding sequence
I recently read a very informative post from Tom454 reference bleeding the brakes. In said post, he stated that it did not matter which caliper was bled first; the important thing was to bleed the fluid intake side first. But, later he talked about the proportioning valve messing up if only a front or rear was leaking (or open), and said you should bleed a front and a rear at the same time.
Since my '70 has one one bleeder in front and two in back, I plan on bleeding front and interior rear first, then bleeding the front again when I bleed the outside rear, in an effort to keep the proportioning valve from going off center. Am I on the right track?
Since my '70 has one one bleeder in front and two in back, I plan on bleeding front and interior rear first, then bleeding the front again when I bleed the outside rear, in an effort to keep the proportioning valve from going off center. Am I on the right track?
Melting Slicks
Joined: Oct 2008
Posts: 2,154
Likes: 69
From: Regina Sk Canada
If this is a new system. You need to start by bench bleeding the master cylinder first. make sure all the air is out of that. Install it back on the car, re-connect the lines. Then do the furthest away from the master which would be the passenger rear caliper. from there the drivers rear, then pass front and last drivers front. This is how i have always done it on any car etc never failed.
Team Owner
Joined: Jun 2000
Posts: 38,923
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From: Southbound
Cruise-In II Veteran
On the rear calipers, the inner halves must be bled before the outers.
The chassis service manual says:
Left rear inner
Left rear outer
Right rear inner
Right rear outer
right front
left front
The chassis service manual says:
Left rear inner
Left rear outer
Right rear inner
Right rear outer
right front
left front
Thread Starter
Advanced
Joined: Jul 2007
Posts: 99
Likes: 1
From: Iowa Park TX
it is a "new" system, as it has been sitting for a LONG time. I'm putting on new hoses, four calipers, and went ahead and replaced the m/c while I was at it. The m/c has been bench bled and reinstalled, the rear calipers went on yesterday, and now I'm waiting on another decent-weather day.
Drifting
Joined: Apr 2008
Posts: 1,992
Likes: 56
From: Antioch IL
If this is a new system. You need to start by bench bleeding the master cylinder first. make sure all the air is out of that. Install it back on the car, re-connect the lines. Then do the furthest away from the master which would be the passenger rear caliper. from there the drivers rear, then pass front and last drivers front. This is how i have always done it on any car etc never failed.
that is how i did mine and they worked fine.
Race Director
Joined: Jun 2000
Posts: 10,039
Likes: 668
From: FL
Way I did mine.
I have used both the gravity method and a Motive Products pressure bleeder. I love the pressure bleeder. It is only 10 psi of pressure which is not going to move that pressure differential switch at all. Just do one bleeder at a time.
