P504 rear brake pistons - chasing a set
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  1. #1
    Fellow Frogger! Pug72's Avatar
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    Default P504 rear brake pistons - chasing a set

    Hi all

    Been having issues with the handbrake not working on my 1972 504. Pull rear calipers off the vehicle yesterday and the pistons are badly corroded.

    Can I buy these new? I have been googling madly, but not having much success.

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    Thanks heaps

  2. #2
    Fellow Frogger!
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    An option is to change the end of your pipes and fit the later calipers. These are easier to find.

  3. #3
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by Bob D View Post
    An option is to change the end of your pipes and fit the later calipers. These are easier to find.
    You even find brakequip have an adaptor off the shelf which screws into the new style calipers and adapts the old imperial flare nut.

    have a look in this: Pictorial Catalogue, Brake Hose Manufacturing Systems, BrakeQuip Australia

  4. #4
    Fellow Frogger! Pug72's Avatar
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    When you say later model, am I assuming 505?

  5. #5
    1000+ Posts driven's Avatar
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    Any Brake Specialist can resleeve brake pistons

  6. #6
    Contented Peugeot Driver addo's Avatar
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    It's the pistons which are rooted, not the caliper bores.

    If you were desperate they could probably be hardchromed and ground, but this isn't the same as sleeving a bore.

  7. #7
    1000+ Posts robmac's Avatar
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    Quote Originally Posted by Pug72 View Post
    When you say later model, am I assuming 505?
    Not necessarily, 504 changed from imperial brake plumbing to metric brake plumbing in latest production. But apparently the calipers are the same.

    Provided the handbrake cable fit you may be able to 505 rear calipers.

    We need a member more aware of models and interchangeability to advise.

  8. #8
    Fellow Frogger!
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    From about 1975 approx the calipers are the same right through the 504s and the 505s.

  9. #9
    1000+ Posts Beano's Avatar
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    That is my understanding also.

    Fit a 505 caliper but you'll have to get the adaptor Robmac spoke of......your brake fittings have the old concave flare fittings whereas Peugeot changed to convex flare in about 1973 or 74.

    Wouldn't hurt to put a helper spring in there too.....handbrakes have a tendency to stick "on" when the caliper gets old. Putting grease under the small (about 5 cent sized) whitish or cream-coloured plastic cap on the back of the caliper is a must. Difficult to find the correct spring if you haven't done it before. You may get one that's too stiff. Better to get a slightly longish, softer one.
    Can be a slight bugger to fit, too.....until you realize it's all about leverage.
    Last edited by Beano; 25th March 2015 at 07:24 PM.

  10. #10
    Fellow Frogger! Pug72's Avatar
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    Thanks for all your replies.

    It's the splines inside the pistons that are stuffed, therefore handbrake not holding.

    As a last resort, I see my favourite parts supplier has brand new calipers!!!!

    P 504/505/604, brake caliper at the rear left, Peugeot 504 (Cabrio), 505, 604. Brake system Lucas, 43mm piston diameter, for 10mm heavy brake disk. Ex

    but these might be the later models ones with the convex flare fitting. I am just waiting to hear back..

    Thanks

  11. #11
    1000+ Posts Beano's Avatar
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    If they also fit a 505, they are definitely the later style.

    How old is your master cylinder ? As your is early, it will be single circuit.
    I don't wish to alarm you unduly, but unless you are very much aware of it's age or condition of the seals inside, your brakes may fail totally at any time. That is why they introduced the double circuit, (at the same time as the different type flare).

    The only warning is a (very) slight sinking feeling in the pedal when you are stopped and have your foot hard down (as in on a hill). It happened to me years ago, but luckily I was in a back street.

    Luckily single circuit masters are cheaper than double.....or you could get it re-sleeved.

    These problems are known quantities in 504s. For instance, ignition switches and ignition locks are known to wear out. And the seat back in '72 models has a tendency to crack and need welding up, with extra strengthening. The design has all the stress being on the right-hand side rather than on both sides of the seat back. (Lovely seats to sit in, though).
    And '72 models had Australian rustproofing, with known weak spots (not that I'm criticizing them....just saying that different years had different areas for rust appearance).

    Speaking of which.....unclip the pieces of black cardboard on either side of the inside of your boot.
    Stuck your arm up and forwards diagonally, reaching up forwards at 45 degrees towards the vent you can see on the outside of the car (only your arm will be inside the turret). Do you feel a piece of sponge ? Take it out permanently (on both sides of the car). They soak up water and promote rust.....water leaks through the vent and collects there in the sponge.
    Last edited by Beano; 26th March 2015 at 07:57 PM.

  12. #12
    1000+ Posts Peter Chisholm's Avatar
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    I agree with Beano about single circuit brakes. I applied the brakes when driving very slowly out of a carpark many years ago one day and the pedal just went right to the floor - no brakes and no warning. If I ever restore the 504 I have, it'll be converted to dual circuit.

  13. #13
    Demannu-facturing! Demannu's Avatar
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    I have a set of early rear brake calipers here that were working fine when removed from the car. I'm putting new lines through my 504, with the later bubble flared pipes, so they are of no use to me.
    Scotty

    Melbourne - Dandenong Ranges

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