Seized brakes.

The piston's on my xj700n have seized up, I have found a source for new pistons and seals but I have no experience with front disc brakes. Will I need new pistons or just the seals?

Cheers.

Faighaigh.

 

You won't know until you remove the piston. It is a good possibility you might need a new piston, deffinetly new seals. If the piston is rusted or pitted replace it, it will leak if you reuse a rusted or pitted piston.

 

The are also threads that describe the Master Cylinder relief port. If that is clogged, the brakes will tend to stick too.

Get that piston out (I'm assuming this is going to be a problem) using a grease gun. It's messy, but it'll remove ANY stuck caliper, very safely, and just has to be cleaned out...with brake cleaner.

Chacal is a great parts source, he can get you anything you need. Consider rebuilding that MC too, and maybe getting new brake lines (depending on condition, but the originals were only meant to last 4 years)

 

mlew is right, you won't know until you get it apart and get everything surgically clean.

A slightly pitted piston is ok, as long as the pits are not in the area where the seals ride. I'ts not unusual for corrosion to take a toll on the part of the piston that's out past the seal, as long as it doesn't end up being the sealing surface once the piston is pushed back in.

This piston, for instance, was perfectly serviceable and is currently back in use:



The pitting that you see is outside where the seals ride so it was not an issue.

 

Thanks fella's, now anyone know where can I find some new brake lines? Looked at all the usual sources but found nothing for the xj700.

Faighaigh.

 

We have them in stock!! Original rubber (with the bright spiral spring-armor gaurd) or braided stainless steel versions.....

 

Hi Chacal, I thought you would could you pm me the price plus postage to Spain?

Faighaigh.

 

Okay, I've sent you a PM.