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Jan 26, 2019 11:55:24 GMT
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Offside front brake was binding on the Mk2 fiesta so checked it out. Looks like the rubber shoe on the main piston has fallen away and I assume this mean that it’s pretty rubbish inside.
What can be done to solve this or am I in need of a replacement calliper?
Thanks in advance!!!
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Jan 26, 2019 11:57:27 GMT
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Photo below...
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Last Edit: Jan 26, 2019 11:59:05 GMT by k11ngsley
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Jan 26, 2019 11:58:26 GMT
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Jan 26, 2019 12:15:58 GMT
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The bit that is hanging off is the dust seal, likely hood is the piston is also rusty, you may well be able to get new parts but a reman caliper won't cost much more.
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Jan 26, 2019 12:20:20 GMT
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I greased it up but it definitely looked rusty inside, I think it’s so rough it’s sticking.
So next question. Where is the best place to get a replacement calliper, I don’t need anything special just something that works!?
Thanks kevins!
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Jan 26, 2019 12:40:41 GMT
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Offside front brake was binding on the Mk2 fiesta so checked it out. Looks like the rubber shoe on the main piston has fallen away and I assume this mean that it’s pretty rubbish inside. What can be done to solve this or am I in need of a replacement calliper? Thanks in advance!!! Why assume? Pop the piston, clean it and the bore, then inspect them. There's still a good chance you'll get away with some wire wool on the piston, fine scotchbrite on the bore, and new seals.
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Jan 26, 2019 12:46:58 GMT
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Honestly because I don’t know how to do it! How does the piston come out and how does it go back in? More than happy to give it a shot before buying a new one
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Jan 26, 2019 12:52:30 GMT
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Also is here a way to detach the brake fluid line? And without having to drain the brake fluid?
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Jan 26, 2019 13:08:28 GMT
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Honestly because I don’t know how to do it! How does the piston come out and how does it go back in? More than happy to give it a shot before buying a new one Undo the flexible brake hose where it attaches to the car. Put a block of wood in the caliper to catch the piston. Use a foot pump on the end of the hose to push out the piston. To refit it, remove the bleed nipple, lube the piston with clean brake fluid and push it in with your fingers. If it takes anymore effort than that, you haven't got it square to the bore.
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Jan 26, 2019 13:15:48 GMT
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I will watch some videos and do some research online I promise but does that mean I can pop the piston out and inspect without detatching the brake fluid pipe.
Ie if I step on the brake with it still attached will the piston pop out? I’m not super clear on how it will work
Thanks nickwheeler!
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Jan 26, 2019 13:35:19 GMT
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I will watch some videos and do some research online I promise but does that mean I can pop the piston out and inspect without detatching the brake fluid pipe. Ie if I step on the brake with it still attached will the piston pop out? I’m not super clear on how it will work Thanks nickwheeler! Don't overthink this, some simple pressure into the inlet port of the caliper will push the piston out. Take the caliper off the car; it's much easier. Stick something like a plastic golf tee up the pipe on the car to stop all the fluid leaking. With a caliper in the state you mention, a full fluid change is necessary anyway
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Have looked up a few guides etc.
Will take apart and investigate - hopefully with a bit of a clean up it will sort itself out!
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djefk
Part of things
Posts: 844
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Jan 28, 2019 12:25:35 GMT
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Personally, for something as fundamental to safety as a key part of a braking system, Iwouldn’t take any chances - it won’t cost much for reconditioned ones, so why do anything else other than replace? Always replace an axle pair in order to avoid the steering pulling to one side when you brake.
Also as has been said, use the opportunity to flush out and replace the brake fluid.
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Last Edit: Jan 28, 2019 12:28:41 GMT by djefk
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ChasR
RR Helper
motivation
Posts: 10,189
Club RR Member Number: 170
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MK2 fiesta brakes questionChasR
@chasr
Club Retro Rides Member 170
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Jan 28, 2019 19:38:50 GMT
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With pistons, I always change them if they are damaged and for the reasons djefk cites. I've been in my old cars when the new owners have 'sanded down' a binding piston and I'll be honest, they've never braked as well as when I owned the car. For the relatively small cost, I'd do the following: -New Caliper rebuild kit with piston from Big Redd as a minimum ; you're looking at £15 a side, but if the caliper bore is pitted as well, it can cost more. -Refurb caliper ; Bigg Red do these as do ECP etc. On the Mercedes W124, a recon item was around £55, and saved me fuel. I went from 37MPG to 45-47MPG once I changed both rear calipers. One I could have got away with but the other was binding terribly and causing me to lose my braking. Is this a standard Fiesta or a normal one? What size wheels are you running? I'm going to hold back suggestions .
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Last Edit: Jan 28, 2019 19:40:58 GMT by ChasR
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Jan 30, 2019 14:33:37 GMT
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Had a look today, corrosion on the piston so that could be it. Have cleaned up as best I can with a bit of wire wool and so far it’s actually improved somewhat.
Will see how I get on and just replace if needed, the braking system warning light flashes every now which must mean it’s still rubbing a bit.
Will take a look at suggested parts to see what’s next. Thanks all!
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ChasR
RR Helper
motivation
Posts: 10,189
Club RR Member Number: 170
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MK2 fiesta brakes questionChasR
@chasr
Club Retro Rides Member 170
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Personally, many would reuse that, but I'd get a piston and seal kit for the sake of £20.
Given your slider bushes have seen better days I'd also get a new set of those. They are around £15 an axle.
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Last Edit: Feb 2, 2019 20:36:47 GMT by ChasR
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Feb 26, 2019 17:15:05 GMT
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Thanks ChasR - I will be grabbing a rebuild kit. The caliper itself is fine so hopefully replacing the inner working will solve the issue. My clean has already made a huge difference so chances are this will be it! Going to get a handheld brake bleeding kit too so I can do the job without assistance. Should be interesting to see how it fairs.
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Last Edit: Feb 26, 2019 17:15:23 GMT by k11ngsley
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ChasR
RR Helper
motivation
Posts: 10,189
Club RR Member Number: 170
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MK2 fiesta brakes questionChasR
@chasr
Club Retro Rides Member 170
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Feb 26, 2019 18:48:31 GMT
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I've used two types of bleeding kit. 1) Gunson's Eezibleed.Despite the bad rep some give it, I've found them OK. Whatever you do, NEVER inflate the system above 15-20PSi, both for the master cylinder reservoir sealing and the bleeder itself. I speak from experience here where I was too lose. 2) Laser Pumper Bleeder SystemThese are almost double the money over the above, which for many isn't worth it, but for me it's a Godsend. No need to lug around a spare, deinflate it to 15PSI, reinflate it, tire yourself out doing this, and you can just crack on with the job in hand. RetroWarwicK has borrowed mine and I believe his thoughts are similar. A mate has suggested vacuum bleeding is better but I've heard a few mixed things about it TBH and I've never really had a problem with pressure bleeding. The two man method works obviously, but there is a risk of damaging your master cylinder from going further down the travel of the bore than the cylinder usually does which can ruin the seals. This can get expensive to fix on a number of cars. You can of course be careful here, but this can take an age with bleeding the brakes then. That and unless you know someone who has nothing else to do in any of their time, getting someone reliable to pump the brakes is tricky. I've had a car mate pump on the brakes as I've had bleeder open despite me telling him to hold his foot still. You can imagine my face when he was laughing about the situation; suffice to say I've never bled brakes with him again. My sister oddly can do it right all of the time.
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