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Replacing brake pads

katar83
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Location: Cambridge

Re: Replacing brake pads

Postby katar83 » Mon Sep 19, 2016 11:52 am

Was reading through quite few brake callipers posts and came across this one. I also had to undo quite few of these bleed screws recently and my findings are:
If its rusted I don't even try to get it out with normal spanner or socket as it seems to always strip the thread and wont budge.
After Deox-C spa it can be removed fairly easy. Alternatively I put the impact gun and impact socket over it and it unscrew it within 2 seconds, whether its rusted or not.
Now I got my spare calipers cleaned up and painted black, I was also thinking about replacing one piston and seal. It doesn't leak right now but the front of piston where it hits the pad is quite pitted and rust damaged.
Only problem is I have no idea how to remove the original piston. It will not move at all. I managed to push it in eventually but getting it out is another story :o
Anyone managed to get it out?
1997, 4.0 LWB X300 - Unlucky car but still a daily driver.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, October 2015. Gone!
1994, 3.2S XJ40 - Long gone.

naki_k
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Re: Replacing brake pads

Postby naki_k » Mon Sep 19, 2016 12:40 pm

compressed air.
when they are not stuck in badly, i have used a bicycle pump with a football inflater attachment, pushed into a nub end of the rubber flexi hose hose. works easily in non stuck pistons, but really depends how stuck yours is. worth a go?
88 3.6 XJ6 PDH/CEM
90 Range Rover Vogue SE 3.9 V8 LPG
91 3.2 XJ6 SportPack Manual
91 4.0 XJ6 Manual
92 4.0 XJR Manual
92 4.0 XJR
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Breaking 40/ 300

Starbuck
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Location: Melbourne, Australia

Re: Replacing brake pads

Postby Starbuck » Mon Sep 19, 2016 1:12 pm

Hi Katar,

As Naki said, compressed air is always my first option. The other way if it is really stuck and you don't mind losing fluid and having to bleed the system, is to attach it to the car with the bleed closed and pump it out using the brake pedal. Be aware that either approach can pop the piston out with quite a bit of velocity behind it if the piston is stuck badly enough - don't have it pointed at anything you value (or can be dented).

Good hunting,

Starbuck
'94 XJ12 (and other toys)

leo_denmark
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Location: Denmark

Re: Replacing brake pads

Postby leo_denmark » Mon Sep 19, 2016 1:37 pm

Starbuck wrote:Hi Katar,

As Naki said, compressed air is always my first option. The other way if it is really stuck and you don't mind losing fluid and having to bleed the system, is to attach it to the car with the bleed closed and pump it out using the brake pedal. Be aware that either approach can pop the piston out with quite a bit of velocity behind it if the piston is stuck badly enough - don't have it pointed at anything you value (or can be dented).

Good hunting,

Starbuck


The piston did hit my thumb first time I tried this. I thought I could control the air and thereby just push it out slowly... :lol: Still hurts just to think about it...
Place a piece of wood where the pads normally are to stop the piston.
BR Leo Jensen - Denmark
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XJ40 3.2 LHD 1992 (VIN: ...660341). Owned since Nov 9th 2005
XJ-S V12 coupe 1977 (SW53309BW). Owned since April 28th 2016. http://www.xj-s.dk/home/
Citroën 2CV 1975. Owned since Sep 1st 1984
Board member of Jaguar Club of Denmark

katar83
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Posts: 2458
Joined: Tue Aug 23, 2011 11:17 am
Location: Cambridge

Re: Replacing brake pads

Postby katar83 » Mon Sep 19, 2016 2:26 pm

I'll give it a go, might need to try an electric pump. Caliper is off the car so cant use the car pump atm :)
1997, 4.0 LWB X300 - Unlucky car but still a daily driver.
1988, 3.6S XJS - Never ending restoration project.
1994, 3.2S X300 - Accident damaged, October 2015. Gone!
1994, 3.2S XJ40 - Long gone.

Dave F111
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Location: Northolt Middx

Re: Replacing brake pads

Postby Dave F111 » Wed Sep 21, 2016 9:29 pm

Another alternative is to fit a grease nipple instead of a bleed nipple and pump it full of grease. More controllable but you have to clean the grease out afterwards.
3.6L Jaguar 1989
4.0L Daimler 1992
Jensen Healey 1974
Standard Flying Nine 1937 project


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