Will an R1 front master cylinder fit?

[DamoK4]

The two sliding pins at the top that join together with the plate. One is seized up pretty bad. Cut the rubber bits off and it was full of grit. Got some penetrant on there hoping it works it’s way through overnight. Will take it to work in the morning and get it in a vice tomorrow if not. I’d already took all the seals out before wd40, no point having a seal kit and opened up caliper and not using them. Was just being lazy because I’d spent ages trying to get the sliding bit off

[Chris_SVS]

I still have nightmares!

[DamoK4]

Originally Posted by Chris_SVS

I still have nightmares!

Wow. Did they clean up?

[Chris_SVS]

Yep made it work somehow

[squirrel_hunter]

The pads look ok. The seals look reasonable, but if you have replacements it will be rude not to use them.

The caliper does need a clean, particularly the inside, thats some lovely gunk you've got in there. Those piston bores must be spotless before reassembly. The pistons don't appear to have anything obvious on them but more investigation once cleaned will be needed.

As for cleaning, remember to remove the pad retaining springs to clean behind. Just remember the orientation they fit for when it comes to reassembly.

As for the slides, yes they should move. I've not had it on a SV but yes they can seize. Working them free, soaking them, applying heat, applying leverage are all valid options, but take care on those last two options. Rebuild kits normally have replacement rubbers in them so I expect you're sorted here. Remember to grease them on reassembly, one of the very few areas of the brakes that should have grease.

[DamoK4]

Gently pressed it out at work. Drier than Gandhi’s sandals in there

[DamoK4]

One of the pins is bent .38mm over the length of it. Hoping it won’t matter as I don’t fancy bending it back. Looks like it’s happened before looking at the end of the pins. They have damage to the ends as though someone has used a punch to get them out. The crud/powder in that hole is half a mm thick on each side

[Dave20046]

It’s worth giving them
A go now and see how they are. Be super careful with the seals and you can transplant to new callipers if needed , but I doubt.

I know people have said grease has no place near brakes, but I really would put a little on the moving parts. EBC said no to the back of the pads, not sliders

[DamoK4]

I have some red rubber grease I was thinking of putting in there as well as on the new seals. I don’t need to put anything on the pistons do I? I’ve heard to use silicon and I’ve heard not to and to use brake fluid

[DamoK4]

I found a post on these forums saying not to use brake fluid to lube the pistons.

"brake fluid is hygroscopic by nature so will draw moisture into it on contact so come winter time the salt from the roads gets pulled in under the seal recesses and corrosion starts. this is the main cause of brakes seizing.

RRG is not the only thing you can use. you can also use silicone grease which has a lot more uses such as for rebuilding forks and greasing your foot peg and lever pivots."

Is this the general opinion? I will be reassembling the caliper tomorrow and doing the other one