How long to change the brake fluid?

8bit

Senior member
Joined
Feb 22, 2013
Messages
4,020
Reaction score
361
Points
98
Location
Aberdeen
I'm sure it was turning the piston, yep. I've done the rear brakes on this and my previous XKRs a few times, nothing seemed out of the ordinary other than that the piston only turned about one and a half times I think before it stopped, but I initially thought that was just because the pads were only about half worn.

I did clean the sliding pins when I put them back in but obviously they were out completely in order to get the caliper off the carrier to change the pads. Why would that affect how far back the piston could be wound in?
 

MrKis

Senior member
Joined
Jun 8, 2009
Messages
5,066
Reaction score
1,414
Points
148
Location
Manchester UK
I did clean the sliding pins when I put them back in but obviously they were out completely in order to get the caliper off the carrier to change the pads. Why would that affect how far back the piston could be wound in?
My fault, getting confused about the movement of the caliper and trying to picture your issue. Thinking it might not have its full range of slide. When of course you cant get the caliper over the disc, with pads.
 

Neilr

Super Moderator
Staff member
I Have Donated !
Joined
Jan 30, 2007
Messages
5,902
Reaction score
531
Points
148
Location
Germany
I took out fairly unworn pads and, IIRC, still had to turn the piston in quite a few turns and it sort-of disappears into the caliper cylinder with the top virtually flush with the rubber seal, coming back out on pressing the brake pedal. Maybe it is caught somewhere?
 

8bit

Senior member
Joined
Feb 22, 2013
Messages
4,020
Reaction score
361
Points
98
Location
Aberdeen
That's sort of my current thinking as well, just not sure what it could be stuck on. I guess if I try loosening the bleed nipple before winding the piston back next time I'll get some fluid leakage?
 

woo5ie

Active member
Joined
Nov 6, 2013
Messages
418
Reaction score
41
Points
28
Location
Saffron Walden Essex
You are probably well aware of this but I seem to remember that one side is reverse threaded.
One and a half turns seems very little. Could that be just a bit of slack. Not sure if that is all models and years of XK.
 

Neilr

Super Moderator
Staff member
I Have Donated !
Joined
Jan 30, 2007
Messages
5,902
Reaction score
531
Points
148
Location
Germany
You are probably well aware of this but I seem to remember that one side is reverse threaded.
I'm trying to find confirmation of this but it is not mentioned in the workshop manual. I don't remember using both of the rewind tools in the set when I did mine. I'm almost sure that they both turn in clockwise.

If you are not using a tool that pushes against the outer caliper "legs" (e.g. the "cube"), you do have to push quite firmly when turning.
 

M100 TWO

Active member
Joined
Jun 27, 2011
Messages
668
Reaction score
32
Points
28
They are both right handed did the tool lock Up by applying to much pressure On the piston?

john
 

8bit

Senior member
Joined
Feb 22, 2013
Messages
4,020
Reaction score
361
Points
98
Location
Aberdeen
I'm certain both sides thread the same way but I can't remember if they're opposite thread, I think they may be.

@M100 TWO not sure what you mean? Once the piston was as far back as it would go I had to use a fair bit of force on the collar that holds the plate to the inside of the caliper to release it certainly?

The tool I have is very much like this one, never had an issue with it on the old car or this one. Mine has flats on the top (right-hand in that photo) end of the silver collar in the middle, to get a spanner on to tighten or loosen.

553773570.jpg



I'm wondering now if this is just the start of that caliper failing...
 

M100 TWO

Active member
Joined
Jun 27, 2011
Messages
668
Reaction score
32
Points
28
you only need a small amount of pressure on the piston to push back, as you wind in the Tommy bar in also adjust the body by winding back so only light pressure is applied on the piston.

john
 

MrKis

Senior member
Joined
Jun 8, 2009
Messages
5,066
Reaction score
1,414
Points
148
Location
Manchester UK
What was the brake fluid level like? Wondering if pushing the pistons back overfilled the reservoir. #longshot.
 
Top