uk brake refurb

after refurbing my uk brakes i thought i would share the experiance,

jack up car

remove front wheel

fasten disc to hub with nuts

remove pins and anti rattle spring and pads

now go get your self a friend or the mrs

press the brake pedal to push the pistons out and watch closely as the pistons will not come out at the same time i had a 1mm shim to put in between piston and disc ( to stop it before it popped out completely )

proceed to do this with each piston

remove brake hose

clamp brake hose i have braided hoses so clamped 2 plates over the end.

remove the 2 mounting bolts that hold the calipar

remove cylinder boots or whats left of them with a small flat end screwdriver

remove the pistons which are very near coming out the correct way is to put a air line on and push out with air,but i used 2 pri bars carefully on the lip that the boots locate on ( make sure you apply even pressure on the piston so it comes out square)

remove piston seals with screwdriver

now its time for some very fine wet and dry to clean your pistons

also use the wet and dry to clean the inside of the calipar clyinder

grease the piston the seal and boot

put in your new seals

push the piston in evenly

put on your piston boots

put on the boot ring i found best to make the ring one big ring and then slip over boot

put the calipar back on and attach brake hose

replace your brake pads and put all pins and anti rattle spring

bleed your brakes with your helper

get them to pump the brake pedal until your brake fluid is flushed through

make sure that the brake fluid is always topped up

once flushed through as your helper is pushing down on padal tighten bleed valve making sure they hold the brake down and dont come back up for another pump.

whilst bleeding the brakes you should always start at the fervest wheel away from the master cylinder.

well i hope this helps anyone attemping it that can use a search button.

Use CW stainless pistons so this is a one off event?

Very nice!!

Thanks.

now i know how to add pictures correctly i have edited for ease of use enjoy

Bump! Looks like I'll be doing this then....! Thanks for the great write up.

Nice write up! Thanks

An excellent and well written guide.

I'm doing my UK rears now so thought this was worthy of a bump.

One tip a brake refurber once gave me is with those fiddly dust boots Toyota use, they can be a PITA to get to stay on the caliper body whilst you get the spring rings on that hold them in place, especially if the shoulder they sit on has been corroded over the years. If you make SURE there is NO grease or fluid on the area, and you don't get any grease or fluid on the boots, cyano-acrylate instant glue ("Super Glue") will hod them nicely in place. If we see people walking into A and E with rubber dust boots stuck to their fingers we'll know why, won't we? I do them that way and it makes a fiddly job easier IMHO.

The boots and the ring spring are by far the worst bit of this job . Thanks for the nice comments glad it helps

As above, how many times I thought I was going to tare the boots with the spring when it slipped off!

Well worth it tho, what a difference it made. Atleast now I've done them with the stainless steel pistons and pins I don't have to worry about them again.

I must be really lucky as I found the springs easy and went on within the first 200 try's

Personally I always split the caliper halves as it's so much better access for cleaning and re-assembly. And these puppies need to be surgically clean in the bores and surrounding area.

When i've done them i split the two halves, even after a thorough clean with brake cleaner and compressed air through

the fluid holes i found a large build up of dirt etc that was stuck on the face by the seals that seal the two halves.

Where the light blue arrows are in the photo

For that reason i'd strongly recommend splitting them if you do them.

Hate to say it but I was informed by toyota NOT to split the caliper, idident ask more questions then that , but you make your owm choice from that

I refurbed mine and cleaned them up without splitting. Checked the fronts again 6 months later and they're both spot on.

I'd guess because Toyota don't supply the two seals, i can't see any other reason.

They don't list the bolts to hold the halves together either, and they are a VERY odd size.

Thinking about it toyota would of also said not to bolt a 67mm turbo on to the side of the engine doesnt mean its wrong though

Thinking about it toyota would of also said not to bolt a 67mm turbo on to the side of the engine doesnt mean its wrong though

Agreed.

The calipers are only two pieces held together with 4 bolts, nothing tricky in taking them apart and putting back together other

than they need to be spotlessly clean

Has anyone ever used ultrasonic cleaning to get their caliper halves clean?

Has anyone ever used ultrasonic cleaning to get their caliper halves clean?

 

/QUOTE]

 

I've cleaned motorcycle carburetors with ultrasonic and it worked very well

 

I media blasted the calipers in the photo i posted

I found these punch pins extremely useful for removing the horrid, corroded pad retention pins. I had to bash mine out and whilst you can try and use an old pin to do it they bend easily and don't allow you to apply enough force.

I also found that if you can get the pin to move a good cm the right way they knock it back again and dremel/cut the end off where the clip goes. That way when you knock it carefully back out you have an little room in the pin retention hole to place the punch pin into and knock the stuck one all the way out. WD40 of course helps. Just clean the entire area with brake cleaner afterwards and ideally use a compressor to remove any dust/dirt particles.

Thanks for the help guys. Does anyone know a part number for the pistons for front uk spec from toyota? Would like to fit stainless, funds say no.

Thanks for the help guys. Does anyone know a part number for the pistons for front uk spec from toyota? Would like to fit stainless, funds say no.

I doubt they will be cheaper from Toyota.

https://www.toyodiy.com/parts/p_E_1994_TOYOTA_SUPRA_JZA80R-ALPVZW_4705.html

I just found them on ebay and very cheap but please check the numbers etc and price at Toyota before

ordering, i have never used the ebay seller or Amayama

https://www.ebay.co.uk/itm/4773114110-Genuine-Toyota-PISTON-FRONT-DISC-BRAKE-47731-14110-/182340536875

Or

https://www.amayama.com/en/part/toyota/4773114110

Or try the traders on here who might beat these prices