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Need to replace servo cylinder

Discussion in 'Brakes' started by thob, Mar 9, 2017.

  1. thob

    thob Member

    Hi, my mechanic says it needs to be replaced. Any idea where I can get one? He says it's a Lockheed cylinder. Mine is a P6 3500s from 1973. He also suggest to replace the master. Is this advised? Thanks

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    Last edited: Mar 9, 2017
  2. quattro

    quattro Well-Known Member

    I rebuilt mine. Check the bores very carefully and have them fitted with stainless liners if required.

    Richard
     
  3. thob

    thob Member

    Hi Richard,
    isn't it cheaper – for me – to invest in a reconditioned one than into my mechanic?
     
  4. quattro

    quattro Well-Known Member

    I believe Mark Gray does rebuilt/exchange units. He arranged the stainless sleeving of mine.

    Richard
     
    thob likes this.
  5. chrisw

    chrisw Active Member

    Geoff at Wins International gets resleeved ones in.
     
    thob likes this.
  6. thob

    thob Member

    I found a supplier around here (Austria) who has one that is new, he claims. I asked where it's from but got no reply yet.
     
  7. thob

    thob Member

  8. colnerov

    colnerov Well-Known Member

    Hi, That looks like it's for a P6 not P6b.

    Colin
     
  9. SydneyRoverP6B

    SydneyRoverP6B Well-Known Member Staff Member

    Never use a booster designed for a 2000 in a 3500. They do not have the capacity required, consequently they suffer damage resulting in failure in a very short space if time. Ask how I know this ;) back in the 1980s, before I started doing my own mechanical work, a mechanic without a clue, fitted a 2000 booster. The brakes were not as they should have been, the booster requiring replacement again for having failed, not long after.

    Slave and master cylinders as Richard advised, should be re-sleeved in stainless steel. Don't even think about using one that isn't, that is very much a false economy.

    Do you know for certain that the slave cylinder that you have is not sleeved in stainless? If it has a stainless steel sleeve, all you'll need is a seal kit, and you're good to go!

    Ron.
     
  10. thob

    thob Member

    Do you say this one is for a 2000?
     
  11. colnerov

    colnerov Well-Known Member

    Hi, Yes, it says the OEM part No. is 578670. The part No. for the V8 is 578668. The advantage ratio is different because the vacuum chamber is bigger giving more advantage on the V8 one.

    Colin
     
  12. thob

    thob Member

    Thanks!
     
  13. mikecoombs

    mikecoombs Member

    The bolt pattern is also different, being on the opposite side. Yours has two bolts on the cylinder side and a clamping bracket on the cylinder nose. Most 2000s have three bolts on the back. there is also a V8 version with three bolts on the back for the P5B
     
  14. thob

    thob Member

    Well, as you can imagine I'm pretty pissed. The mechanic who fixed the wrong part invested some time because it didn't fit (and he told me). The parts dealer convinced me that this is a valid replacement which it isn't.
     
  15. harveyp6

    harveyp6 Well-Known Member

    I think you'll find it's the same unit.
     
  16. The Rovering Member

    The Rovering Member Well-Known Member

    I fitted 3500 front calipers & discs to Bruiser but it never occured to me to fit the servo from a V8 too. She stops very well & there have been no ill-effects as yet although l wouldn't actually fit a 2000 unit to a V8 car.
     
  17. harveyp6

    harveyp6 Well-Known Member

    Some 2200 cars came from the factory like that when the 4 pot calipers were short supply.
     
  18. The Rovering Member

    The Rovering Member Well-Known Member

    I think the short-term servo failure won't be a hard & fast rule then.
    Still best to fit the correct servo though & l will very likely fit a V8 unit if & when my servo fails.
     
  19. thob

    thob Member

    Just had a talk with the supplier. He claims this part is being used in Jags and Austin Healeys and he never ever got any complaints. He activley discouraged me to get a reconditioned one but would accept if I return this one-
     
  20. SydneyRoverP6B

    SydneyRoverP6B Well-Known Member Staff Member

    I would never buy a new booster again, same with rear calipers or master cylinder. Just a waste of money. The mild steel bores will suffer pit corrosion and then leak. With a reconditioned unit that has had the slave cylinder relined in stainless, along with a brass sleeve for the air control piston, you won't have a pitted cylinder again. The seal kit within is just the same, the diaphragm within the vacuum chamber will last for eons, so all you really need are the seals for the slave cylinder and a new air control valve.

    Ron.
     

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