74 620 brake master cylinder

[Richie]

Hey, so I went to go bleed the brakes for like the 10th time and brake fluid is not getting to the rear. I switch the lines from front and rear at the brake master cylinder and I finally got brake fluid to go the rear but nothing to the front. I just bought the master cylinder, its 3/4th cylinder. I put on the bench and bled it and it worked. Any suggestions on what i should do next? Thank you. 

 

Could i also need to adjust the power brake booster since that is also new?

Edited March 20, 2022 by Richie

[datzenmike]

It would appear that the master is at fault, a victim of shitty after market parts from..... China.

[rosso]

You can double check the master cylinder on the car. Just take out the bleed screw for the rear brakes (that's the front reservoir) and hold your finger on it. Then have someone press down on the brake pedal gently - you should feel pressure under your finger. Let your finger relax against the pressure - you should get air or fluid. It's a bit messy so have rags or something to catch the brake fluid.

[datzenmike]

7 hours ago, Richie said:

  I put on the bench and bled it and it worked. Any suggestions on what i should do next? Thank you. 

 

 

 

 

7 hours ago, Richie said:

 

Could i also need to adjust the power brake booster since that is also new?

 

The booster push rod in the back may need adjusting. Adjust so that there is 1/16" to 1/8" of pedal play.

[Richie]

16 hours ago, datzenmike said:

 

 

 

 

 

The booster push rod in the back may need adjusting. Adjust so that there is 1/16" to 1/8" of pedal play.

I have been watching videos trying to figure out how to actually adjust the push rod. I havent had time yet to take the master cylinder off to see the booster, is it just an adjustment nut? nothing to crazy?