R10 front callipers
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Thread: R10 front callipers

  1. #1
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    Default R10 front callipers

    I have a troublesome right front calliper at the moment on my R8.

    It's only the right one that's an issue but I am considering buying a new front pair. I could no doubt trawl around the usual suspects but hopefully someone has done that recently & is kind enough to simply apprise me of what seems currently to be the best source.

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    It would, of course, be delightful were one (or a pair) to be available locally but that seems implausible.

    Also, out of curiosity, can some other calliper fairly readily fit?

    cheers! Peter

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    Hi Peter

    You don't say what the issue is. Is it dragging, not coming on, pulling to one side...?

    Bakes don't get much simple than these (but they were good enough to go to the moon!!!). And the front ones simpler are the simplest of all. They are however a bit fiddly to get just right.

    I'm bound to have a pair that I could rebuild for you but before you go that far you might want to check a few things first, like their alignment in the calliper bracket (are the pads wearing evenly or are they decidedly wedge shaped?).

    They are a single circuit system so if one component fails you have no brakes, so before you hit the "buy now" button replace the flexible brake hoses. They do deteriorate from the inside and block. I thought this was a bit of a myth until I had a couple of later model vehicles with this issue (later = R12...). Sometimes when hoses block they can act as a bit of a one-way valve.

    You can use a G clamp to push the piston back into the bore that sometimes works but if the piston is corroded that can stuff the seal.

    If you do decide to get the callipers rebuilt by a brake specialist they do need to be aware of the correct alignment of the self adjuster circlip with the bleed valve.

    I have a bit of a rant re R8/10 brakes here:
    Sunroof and JohnW like this.
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  3. #3
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    I'm surprised to learn that 4cvg even has a use for brakes..

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    That's a bit unkind 59 Florrie.

    I mean, even a brick on a piece of string needs to be adjusted correctly...
    Daily Drivers: R10, R12, R17T(?) Decouvrable

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    R8 (1.4 motor, 4 shock rear end), Dauphine, Pugeot 404

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    Dauphine X2, R10 X lots, R12 X2, R16TS, R17TS

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    Quote Originally Posted by Exfrogger View Post
    Hi Peter

    You don't say what the issue is. Is it dragging, not coming on, pulling to one side...?

    Bakes don't get much simple than these (but they were good enough to go to the moon!!!). And the front ones simpler are the simplest of all. They are however a bit fiddly to get just right.

    I'm bound to have a pair that I could rebuild for you but before you go that far you might want to check a few things first, like their alignment in the calliper bracket (are the pads wearing evenly or are they decidedly wedge shaped?).

    They are a single circuit system so if one component fails you have no brakes, so before you hit the "buy now" button replace the flexible brake hoses. They do deteriorate from the inside and block. I thought this was a bit of a myth until I had a couple of later model vehicles with this issue (later = R12...). Sometimes when hoses block they can act as a bit of a one-way valve.

    You can use a G clamp to push the piston back into the bore that sometimes works but if the piston is corroded that can stuff the seal.

    If you do decide to get the callipers rebuilt by a brake specialist they do need to be aware of the correct alignment of the self adjuster circlip with the bleed valve.

    I have a bit of a rant re R8/10 brakes here:
    Many thanks for the reply.

    Pulling to one side. Mostly under braking but sometimes not (alignment has been checked & tyres laterally swapped in case there was tread camber thrust)

    Dunno what the pad story is but assume my mechanic would have noticed. Brake hoses replaced.

    Calliper disassembled, cleaned & reassembled with a (brake fluid tolerant) "O"ring as seal.

    I assume that he's on to the circlip point but, in case not, I'll pass your remarks on to my (old-school) Renault mechanic &, in any event, shall probably proceed to getting you to rebuild a pair for me.

    Thanks again, Peter
    Last edited by 4cvg; 21st July 2019 at 09:44 PM.

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    Quote Originally Posted by 59 Floride View Post
    I'm surprised to learn that 4cvg even has a use for brakes..
    Well I don't much but occasionally a red light stop signal has to be taken note of.
    Sunroof and JohnW like this.

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    An old school Renault mechanic would know about the self adjusting circlip trap. That said, air in the system should not cause pulling to one side, just spongy brakes.

    With the calipers overhauled, and presumably not leaking, and brake hoses replaced, the place I'd be looking now would be the upper control arm bushes. They are still available but it can be a PITA to remove the upper control arms if they've been in for a while.

    But with an R10 front end in a 4cv I'd imagine the UCA bushes aren't all that ancient.

    Just a thought, if the calipers have been rebuilt with O-rings and not the square seal you might have some brake fluid contamination on the pads if they haven sealed properly - and that would cause some of the issues you mention.
    Daily Drivers: R10, R12, R17T(?) Decouvrable

    In the Shed(s):
    R8 (1.4 motor, 4 shock rear end), Dauphine, Pugeot 404

    In the Past:
    Dauphine X2, R10 X lots, R12 X2, R16TS, R17TS

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    Quote Originally Posted by Exfrogger View Post
    An old school Renault mechanic would know about the self adjusting circlip trap. That said, air in the system should not cause pulling to one side, just spongy brakes.

    With the calipers overhauled, and presumably not leaking, and brake hoses replaced, the place I'd be looking now would be the upper control arm bushes. They are still available but it can be a PITA to remove the upper control arms if they've been in for a while.

    But with an R10 front end in a 4cv I'd imagine the UCA bushes aren't all that ancient.

    Just a thought, if the calipers have been rebuilt with O-rings and not the square seal you might have some brake fluid contamination on the pads if they haven sealed properly - and that would cause some of the issues you mention.
    It's the R8 (bought new in '66 by my mother) & not the 4CVG but it has also had a recent bare-shell rebuild; we can't recall if we did the control arm bushes or not. (I had the same tentative hypothesis about them). Basically, because removing them is indeed such a drama & the problem is "sudden onset", we are trying to eliminate everything else first (& figured that a new pair of callipers wouldn't go astray).

    I'll pass on the leak point (which is well taken) but the problem was before & after the rebuild & no leaks were apparent upon rebuilding.. Are the square seals still readily available?

    cheers! Peter
    Last edited by 4cvg; 22nd July 2019 at 11:06 PM.

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    Before you go any further, check the pads .could be glazed on one side.had the same problem and now pulls up straight with no hands on the wheel

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    Quote Originally Posted by potentz View Post
    Before you go any further, check the pads .could be glazed on one side.had the same problem and now pulls up straight with no hands on the wheel
    shall do, ta!

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    They are readily available the problem is that the organisation concerned has no Paypal and they don't speak English. I have just asked my French friend to buy me 3 sets. Haven't got a price yet. I have been using round and find they do tend to slow leak. I have 3 cars with these discs so three sets.

    https://www.piece-alpine-r8.fr/r8-r8g-r ... ge-r8-r8g/

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    Quote Originally Posted by potentz View Post
    Before you go any further, check the pads .could be glazed on one side.had the same problem and now pulls up straight with no hands on the wheel
    I asked. Each side had new hoses fitted & each side's calliper thus came off. Pads were not glazed & all were "touched up".

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    Quote Originally Posted by Sunroof View Post
    They are readily available the problem is that the organisation concerned has no Paypal and they don't speak English. I have just asked my French friend to buy me 3 sets. Haven't got a price yet. I have been using round and find they do tend to slow leak. I have 3 cars with these discs so three sets.

    https://www.piece-alpine-r8.fr/r8-r8g-r ... ge-r8-r8g/
    Thanks. Hopefully (given what you say), an alternative exists.

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    Quote Originally Posted by 4cvg View Post
    Many thanks for the reply.

    Pulling to one side. Mostly under braking but sometimes not (alignment has been checked & tyres laterally swapped in case there was tread camber thrust)

    Dunno what the pad story is but assume my mechanic would have noticed. Brake hoses replaced.

    Calliper disassembled, cleaned & reassembled with a (brake fluid tolerant) "O"ring as seal.

    I assume that he's on to the circlip point but, in case not, I'll pass your remarks on to my (old-school) Renault mechanic &, in any event, shall probably proceed to getting you to rebuild a pair for me.

    Thanks again, Peter
    Hi Peter,

    Did he do both fronts at the same time? Do you know whether the pads are wearing evenly left side and front side, apart from whether they are showing signs of wedge-shaped wear?

    Just a check, but are both of the eye bushes at the end of the steering rack OK?

    No doubt when I read further I'll find you've already sorted it out.

    Cheers
    JohnW

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    Quote Originally Posted by JohnW View Post
    Hi Peter,

    Did he do both fronts at the same time? Do you know whether the pads are wearing evenly left side and front side, apart from whether they are showing signs of wedge-shaped wear?

    Just a check, but are both of the eye bushes at the end of the steering rack OK?

    No doubt when I read further I'll find you've already sorted it out.

    Cheers
    thanks John, dunno but I'll pass it on

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    I had a similar problem that turned out to be the flexible hoses were had it, replaced them and all was good

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    Quote Originally Posted by Peter J Kent View Post
    I had a similar problem that turned out to be the flexible hoses were had it, replaced them and all was good
    Me too several times.

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    Quote Originally Posted by Peter J Kent View Post
    I had a similar problem that turned out to be the flexible hoses were had it, replaced them and all was good
    Yep. Our first hypothesis. (Nice to learn that R12 ones suit.) But, alas, not the issue this time.

    Regrettably, Ron's hoist is clogged up for a bit awaiting parts for another vehicle but next checks will occur when its free.

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