Brake slides on the Mav stuck.

[Covo71]

Hi, finally have some time to work on the Mav. Replaced the rear brakes and noticed only one of the pads is worn so I am thinking it is the slides are stuck. I am unsure how to remove if required and service or clean up and re-grease as required. Anybody got any tips on how to do this?
Cheers

[dom14]

Check on youtube. There are quite a few videos showing how to do this.
Use the correct brake caliper rubber grease for the pins to lubricate them.
You might have to buy the brake caliper minor repair kit, as it is likely the reason the pin
is ceased due to rubber boot being damaged and dust and moisture getting into the hole.
It may be not that easy to get the ceased pin out. Use grip pliers and bit of heat(LPG torch) if necessary.

It will be a good idea to use some valve grinding paste with the pin to grind the pin bore and smooth it out, as the rust and ceased pin has obviously roughened up the bore surface.

Ebay has brake caliper minor repair kits. Make sure you order the correct one for your Patrol model if you order online.

[Bigcol]

while the calipers are still attached to the axle housing, undo the bolts on the slides (easier to do while they are held firmly)
then undo the 2 bolts holding the calipers on
remove, and pull apart

a good idea is to use something to "clamp" the brake fluid hose, and undo that hose
just saves having to spend soo long bleeding the brakes system

once you have the caliper out and pulled apart, use 200 grit wet & dry to clean up the pins

while you have the caliper off, using a G clamp, push the piston back into the caliper
if it is really hard to push in (assuming you have removed the Brake fluid line), THAT'S the problem there ..........
get a kit to re-build the caliper

when you re-assemble the caliper, use Copper Grease, a light smear over the sliding pins


never ever use Valve grinding paste on anything other than Valves - they are hardened steel - brake parts are Cast - a lot easier to damage

[dom14]

never ever use Valve grinding paste on anything other than Valves - they are hardened steel - brake parts are Cast - a lot easier to damage

What would you use to smooth out the bore of the slide pin hole?

[Bigcol]

400 wet n dry

[dom14]

400 wet n dry

How would you get that into the bore of the pin?

[Bigcol]

you wrap it around a slightly smaller bolt than the hole............

emegy6yg.jpg

[dom14]

you wrap it around a slightly smaller bolt than the hole............

emegy6yg.jpg

Sure, but what's wrong with applying a bit of valve grinding paste on the pin and grind off the unevenness on the pin and bore at the same time, just like you use it on valve seats?
After that, you can clean it up and apply the grease & install the boot.
That's how I did it(just few minutes of forward and backward motion). The pin and the bore came out pretty smooth after that.
I was careful not to overdo it or leave any grinding paste residue.
It's been going ok since then, by the looks of it.

[Bigcol]

Sure, but what's wrong with applying a bit of valve grinding paste on the pin and grind off the unevenness on the pin and bore at the same time, just like you use it on valve seats?

pretty much the same reason for NOT using Rubber Grease on the slide, but using Copper Grease
or using Transmission fluid instead of Brake Fluid

use the correct tools for the Job

or dont touch it

[dom14]

pretty much the same reason for NOT using Rubber Grease on the slide, but using Copper Grease
or using Transmission fluid instead of Brake Fluid

use the correct tools for the Job

or dont touch it

Yep, I agree copper grease is a better idea, since it's temperature rating is higher than red rubber grease.
I think the grease I used for mine was copper grease anyway, because it comes in small sachets at Super cheap auto with the name on it something like brake caliper grease or similar.
Though I use grinding paste to smooth out similar applications with good results.