Brakes lock up

HOFFERT88

MEMBER
1986 NISSAN PATHFINDER
2.4L
4 CYL
4WD
MANUAL
295,000 MILES

So first off, I do not have a pathfinder. It is a 1986 (Non-hardbody) 720 4x4. I have changed everything in the system and I still get a pressure buildup while driving (in front driver). New caliper, software, and removed and cleaned all hard lines. Master cylinder is 2 years old so I will be replacing that again, but I don't think that is the problem as only the front driver is building pressure while driving and the passenger side is just fine. There is a single line for the front brakes that comes out of the master and then goes to a "T" block to split between the left and right. I have removed and cleaned/replaced everything from there on and I'm still getting pressure buildup.

3 Replies

ASEMASTER6371

MECHANIC
52,797 POSTS

Good evening,

This sounds like a collapsed brake line. It allows fluid into the caliper but does not allow return flow.

Replace the brake hose from the caliper to the hard-line.

https://www.2carpros.com/articles/brake-caliper-replacement

https://www.2carpros.com/articles/how-to-bleed-or-flush-a-car-brake-system

Roy

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Sunday, January 24th, 2021 AT 5:55 PM

HOFFERT88

MEMBER
18 POSTS

I have replaced that twice now. As well as the caliper, master cylinder (2-3 years ago now), cleaned out all hard lines, and cleaned out the "T" block. I have not checked the free play in the pedal yet (on my list for today) but I doubt that's the problem with it being only a single caliper.

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Tuesday, January 26th, 2021 AT 8:34 AM

ASEMASTER6371