Rear brake Help - regards piston and bleeding

[Mr2Owner]

Need some advice, my rear brake seized on causing smoke. I stripped it down and the the sliders were free, etc. The problem was with the piston, the rubber boot was ripped and a little bit of rust on the piston itself.

I was pumping the brake pedal to push the piston out to clean and work it free, and due to my own fault the piston came out the whole way. I quickly clamped the hose but obviously lost a small bit of fluid.

Now, when I put the piston back in and screw it in I have no brake pedal. I wound the piston out a bit again with the tool and I got a pedal again. But the piston was now out too far to fit over the pads, I screwed it back in to fit over the pads but then I lost the brake pedal again.

What's the problem here, how come I got a pedal when the piston is wound in nearly full but not when its out, is this cause I've lost fluid? Will bleeding the caliper sort it?

Think I need a new caliper anyway as the boot is goosed.
The joys of old cars

[thomp1983]

You can replace the boot easy enough, and yes the caliper will need bleeding if the pistons been out as you introduced alot of air into the caliper

[Mr2Owner]

You can replace the boot easy enough, and yes the caliper will need bleeding if the pistons been out as you introduced alot of air into the caliper

Cheers for the reply. Hopefully I'll get away with just bleeding the 1 caliper, hate bleeding brakes. Strange the way I got a pedal when the piston was wound in full, maybe thats because there is fluid behind it then, but no fluid when its pushed out due to the fluid I lost.

Will Toyota sell the boot separately? Or do I have to get the boot off a brake recon company like Brakes International, or will a motor factors have it?

[thomp1983]

Brakes international or bigg red will be able to apply a dust boot

[Mr2Owner]

Does the piston have to come back out to fit the new boot?

[thomp1983]

I think so yes

[markstevieandmads]

You obviously havent a clue on how brakes work so id be taking that to someone who does. Dont mess with brakes if you dont know what your doing
Sorry to sound harsh.

[Mr2Owner]

I got away with just bleeding the affected caliper, thank god, wasn't in the mood for taking all wheels off and bleeding the entire car. I used a 1 man airlline bleeder on it, there was no fluid coming for a while when I first opened the bleed nipple but eventually the fluid started to run. Was quite a lot of air in it.

@ Markstevie - I actually rebuilt the rear brakes on my old Integra before, few years ago and just don't remember the full process. Obviously when I go to fit the new boot I won't be long finding out if the piston has to come fully out again, but sometimes its nice to just know something for before you start.

Iv'e done all my own brake work before and have done again this time too. But thanks for the safety warning.

[abovetherim]

Have a read of this
http://www.imoc.co.uk/forums/kb.php?mode=article&k=118
Its for the mk1 but they are essentially the same
Did you follow the procedure to set the handbrake?

[Mr2Owner]

Have a read of this
http://www.imoc.co.uk/forums/kb.php?mode=article&k=118
Its for the mk1 but they are essentially the same
Did you follow the procedure to set the handbrake?

Cheers for the link, I'll have a read
Yeah, I remembered reading about the handbrake setting before on these forums and had a quick search on it. It's nothing specific to the Mr2 though is it, I remember the Honda's I owned used to have that dimple on the inner brake pad to sit between the piston slots but some aftermarket and spurious brake pads wouldn't have the dimple. And other lads used just file the dimple off the oem pads too and just wind the piston out to meet the pads the way you would with any car.