Technical stuff > Brakes

Front Driver’s Side Brake Caliper Locking Up Randomly

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George-S:

Hi all,

I'm really hoping someone has some advice for me ..
My coupe’s front driver's side brake caliper keeps randomly locking up, and I feel like I’ve tried everything to fix it.
The car sometimes drives fine, but occasionally, the caliper jams and won’t release until the brake cools down.

This happens even on short drives (e.g., a 5-minute trip).
It only affects the front driver's side—all other brakes work absolutely fine.
When it locks up, I can smell the pads burning, and if left too long, it completely seize.

What I’ve Done So Far:

Dismantled the caliper replaced seals, cleaned sliders, replaced brake pads & pins regressed everything multiple times.
Bled the entire system 5+ times—fluid is clear with no bubbles.


Brake Components Replaced:
Front Discs & pads
Both feed Copper oil lines & stainless braided brake hoses
After my refurbs didn’t work I purchased a new Caliper (newly refurbished one from Italy—same issue occurred)
Brake master cylinder (replaced about a year ago)


Questions ..

Brake Booster: This is the only part i have not replaced but I simply don’t know if this kind of behaviour can come from that ?

Master Cylinder Hard Line Placement: Is there a specific order in which the hard lines need to be connected to the master cylinder?

Here is a video of me spinning the wheel after the caliper locked up this morning https://photos.app.goo.gl/YRM2nzLo5CUmARBN7

At this point, I’m completely stumped. Any advice or suggestions would be greatly appreciated!

 :-\

SanRemo78:
Have you replaced the master cylinder? I had a similar issue on a Fiat 124 Spider. Slackening off the securing nuts between the master cylinder and servo would clear this indicating that the push rod length was incorrect - too long, needed shortening. If you've changed the length of the cross bulkhead pull shaft that may have had the same effect? It is odd that this would affect only one calliper though.

Guy

George-S:
Hi Guy,


Yes replaced the master cylinder.
Defiantly wouldn't have thought to try this, I will loosen it off a bit see what happens.

Thanks for the idea.

Cheers George

HFStuart:
Something odd about those sliders. Are they cracked?

George-S:
Not to my knowledge...

They have been in and out a few times not noticed anything odd.
When its out the car it all sliders really nicely.

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