Difference in master cylinders?

[blazed07]

Have an '82 Blazer that was converted to FI from an '87 donor Blazer. At the same time the hydroboost system on the '82 was experiencing some leaking issues. I decided that the most inexpensive solution was to swap the vacuum booster and master cylinder from the 87 to the 82. The '87 was equipped with the antilock system. Seemed to have worked fine for awhile, but just recently we experienced some icy road conditions. I attempted to make a stop at an intersection and my rear brakes locked up. A few days later,I tested the brakes during normal driving conditions and have verified that the rear consistently locks well before the front.

My question is: Is there a chance that the front and rear brake lines could have been swapped on the newer master cylinder and now brake bias is favoring the rear brakes vs. the front? IF so, can I use an '82 master cylinder with the brake booster off of the '87?

 

[BlazerBud]

I don't know if it was swapped or not, but I do know that you can and probably should get a bias control valve and adjust it correctly for your specific truck. That is once you figure out if it was swapped or not.

 

[blazed07]

Clarification

I should clarify this some. I did not intentionally or accidently swap the lines. The brake lines are two different sizes going into the master cylinder. I think that the connections might have been reversed between the '82 and '87 master cylinders. Any chance of that?

 

[bradshawtech]

The larger of the two halves of the resevior(sp) on either system is the front brakes as there is more fluid consumed with the pad wear. What did you do with the different fitting sizes? Did you change them down to the distribution blocks?