Need to replace servo cylinder

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

Richard
 
Hi Richard,
isn't it cheaper – for me – to invest in a reconditioned one than into my mechanic?
 
I believe Mark Gray does rebuilt/exchange units. He arranged the stainless sleeving of mine.

Richard
 
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.
 
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.
 
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.
Do you say this one is for a 2000?
 
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
 
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
 
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.
 
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.

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.
 
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.
 
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-
 
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-

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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