Lotus Elan Central

by **surfboardfiller** » Fri 22.06.2007, 15:43

geoffsmith wrote:WillB's flogging one on FleaBay.

I know, but I have a problem with fitting 2nd hand parts, and a new (non lotus) one will cost about £70 if I can get it.

by **Candles** » Wed 08.08.2007, 13:11

I few years ago I had a brake line split (the wheel-rub issue that has been described elsewhere). It was my understanding that the whole point of the diagonally-separated systems was to retain some braking when one system failed. In my incident, there was either very little or no braking retained. Having recently installed the Wilwoods and now being able to lock the wheels, it is always the front left that locks first. Would these two facts be indicative of the master cylinder being faulty and hence perhaps providing more pressure to one circuit than the other?

Candles.

by **Monty** » Wed 08.08.2007, 20:19

Candles wrote:I few years ago I had a brake line split (the wheel-rub issue that has been described elsewhere). It was my understanding that the whole point of the diagonally-separated systems was to retain some braking when one system failed. In my incident, there was either very little or no braking retained. Having recently installed the Wilwoods and now being able to lock the wheels, it is always the front left that locks first. Would these two facts be indicative of the master cylinder being faulty and hence perhaps providing more pressure to one circuit than the other?

Candles.

arrrrrrhhhh thats strange as my front left locks 1st and i was putting it down to sticking pistons, but i`ve clean them several times. Since i`ve got adjustable dampers i`m now thinking it could be down to corner weighting as i believe that if not balance correctly it could effect braking

So i might get this done soon before bedford trackday,

by **Candles** » Thu 09.08.2007, 10:19

Hmmmm....... I wonder if the shuttle for the right-hand circuit is prone to the seal failing gradually over the years. That might explain both our findings. I think I am going to get a new cylinder and fit it just to see.

Candles.

by **John_W** » Thu 09.08.2007, 19:23

Candles,

Like you, I thought that the dual master cylinder was supposed to leave you with brakes if something happened to one wheel. That's been my belief since they were introduced about 1970. However last year my Discovery had a brake leak on one wheel, and it resulted in no brakes at all. Quite alarming, but no harm done.

So, again like you, I'm left not really knowing what the dual circuit actually does, 'cos it sure doesn't leave you with any brakes.

I presume that to complete your experiment you will fit the new master cylinder then induce a leak in one wheel to see if you crash or not. Let me know what you find out.

John :wink:

by **Monty** » Thu 09.08.2007, 22:59

Candles wrote:Hmmmm....... I wonder if the shuttle for the right-hand circuit is prone to the seal failing gradually over the years. That might explain both our findings. I think I am going to get a new cylinder and fit it just to see.

Candles.

I`d also be interested on the findings on the left front locking and if u get a better pedal feel after a new master cylinder is fitted as my pedal is slightly spongy to stock.

by **surfboardfiller** » Thu 13.09.2007, 11:36

I bought a BMC based on the info provided on this thread, I could have gone to Lucas and an independant motor factors and probably got a better deal but was in a saturday morning rush and now it's fitted by the local lotus garage I am really pleased! Had the slider pins replaced on the calipers too sometimes it's no good just cleaning them; They were only a few £s and the BMC was £100 incl VAT

Cheers all!

Phil

by **Mcmilab** » Wed 17.10.2007, 16:22

Hi Surferphil,
can you give me the part number and a contact for the people you bought your BMC from? Mine is giving all the hassles that the above thread lists and would love to get a replacement for £100, and since I live in Jersey I dont even have to pay VAT

Happy days.

Thanks

Al

by **Elanlover** » Tue 30.10.2007, 16:15

ESM wrote: .............I reckon we now need to find a reasonably priced compatible part with a bigger piston........

I could be up for that sort of improvement.

by **surfboardfiller** » Tue 30.10.2007, 19:12

Mcmilab wrote:Hi Surferphil,
can you give me the part number and a contact for the people you bought your BMC from? Mine is giving all the hassles that the above thread lists and would love to get a replacement for £100, and since I live in Jersey I dont even have to pay VAT Happy days.

Thanks

Al

it was a 'Unipart' product

Trying to find the reciept for you! still looking.. :roll:

by **petezipp** » Mon 05.11.2007, 21:31

I was shocked by the price & non-availability of the cylinder.
Kind people at SAF (sutton in ashfield) found one for me.
Ref was LM50087 but it's steel not alloy but I can't see that will matter, just Colin's adding lightness.

Unfortunatly I've still got a Long pedal so I keep bleeding.

I've only got the valves or servo left to change - any body got a better idea?
pete

by **lotuska** » Tue 06.11.2007, 18:42

Make sure that you haven't got air trapped in the end of the master cylinder, I bench bleed first and then transfered to the car.

by **petezipp** » Tue 06.11.2007, 21:36

Not too sure what Bench bleeding is ???

Tried the old " wedge the pedal down with a piece of wood , overnight" but that has'nt worked yet.

Going to try to conect the pipes without rear valves in , see if it's them at fault.
Cheers

-------------------
Use the old Eclat for a bit longer !!!

by **nitroman** » Thu 08.11.2007, 14:43

Pete, bench bleeding is just like it sounds; bleed the master B4 mounting 2 the car (ie, on a 'bench'). This allows you to FULLY move the piston along its path to expunge any air. Once connected to the pedal (in the car), it MAY no longer allow the piston to move a complete stroke.

by **surfboardfiller** » Fri 16.11.2007, 15:21

Unipart Brake Master Cylinder:

Product Code: BUYOUT0014957
Description: FPSPMH392 MASTER C

Price: 93.69
incl VAT 110.09 GBP

This is fitted to my car by a good Lotus Dealer mechanic. Has done a £1000 miles or so in my car. :-D

Cheers,

Phil

by **petezipp** » Sun 18.11.2007, 21:02

Well that was an easy job (not) master cylinder changed but still a long pedal.

I should have blanked off the rear calipers first . it seems to be a big improvement but it was a bit trickey because I have braded hoses.

I will take both rear calipers to my local factor for refurb on Monday and hope that will do the trick.

I purchased a vacuum set ( Draper VS402 £44) which is very good for bleeding and also helps with heater system & Turbo valve checking.

by **rip** » Mon 19.11.2007, 09:53

peterthelotus wrote:
I will take both rear calipers to my local factor for refurb on Monday and hope that will do the trick.

With nice clean, steel cylinders? Personally I would rather swap them out in favour of Dorman's, which have hardened aluminium cylinders. These only cost about £110 new, but they do need some work on their handbrake levers.

by **Monty** » Sat 23.02.2008, 22:32

peterthelotus wrote:I was shocked by the price & non-availability of the cylinder.
Kind people at SAF (sutton in ashfield) found one for me.
Ref was LM50087 but it's steel not alloy but I can't see that will matter, just Colin's adding lightness.

Done a quick search on some of the part number above, didn`t come up with much except this Italian site www.lpr.it/idraulicalpr.asp?lpr=1318

looks like the BMC is off

VAUXHALL Cavalier (1988-1995) 2.0i, 2.0i 16V/4X4, 2.0i CAT, 2.0 SRI/16V -ABS 09/88-08/95
1318 BMC 22,2 ID Code EF

OPEL Vectra A 2.0, 2.0 16V, 2.0 4X4, 2.0 16V 4X4 (P1000001-)(-ABS) -08/95
1318 BMC 22,2 DELCO

Part numbers
BOSCH 0986480131
BENDIX 132130B
ATE 24.2122-1746.3
OPEL 3492616
OPEL 558107
FTE H2296401
DELPHI-LOCKHEED LM50087
LUCAS PMH392

With the OPEL 558107 Could only find www.oscaro.com/fiche.asp?ID_OSC_LEVELS=2701&ID_OSC_TYPES=18551&ID_GENERIC_ARTICLES=258&ID_ARTICLES=298530

Edited
More finds

Monty wrote:More part numbers here www.gglotus.org/ggpart/m100xref.htm

AC Delco part no 174-812 (standard)
Durastop 18M478

On the Delco site came up with 198.208.187.182/internet/VehiclePartFits.jsp

1993 PONTIAC LEMANS SE L4 1.6L 1588cc 98cid GAS FI N Engine VIN = 6
1993 PONTIAC LEMANS VALUE LEADER L4 1.6L 1588cc 98cid GAS FI N Engine VIN = 6
1992 PONTIAC LEMANS VALUE LEADER L4 1.6L 1588cc 98cid GAS FI N Engine VIN = 6
1992 PONTIAC LEMANS L4 1.6L 1588cc 98cid GAS FI N Engine VIN = 6
1991 PONTIAC LEMANS LE L4 1.6L 1588cc 98cid GAS FI N Engine VIN = 6
1991 PONTIAC LEMANS LE AEROCOUPE L4 1.6L 1588cc 98cid GAS FI N Engine VIN = 6
1991 PONTIAC LEMANS VALUE LEADER L4 1.6L 1588cc 98cid GAS FI N Engine VIN = 6
1990 PONTIAC LEMANS LE L4 1.6L 1588cc 98cid GAS FI N Engine VIN = 6
1990 PONTIAC LEMANS LE AEROCOUPE L4 1.6L 1588cc 98cid GAS FI N Engine VIN = 6
1990 PONTIAC LEMANS VALUE LEADER L4 1.6L 1588cc 98cid GAS FI N Engine VIN = 6
1990 PONTIAC LEMANS GSE L4 2.0L 122cid GAS FI N Engine VIN = K
1989 PONTIAC LEMANS AEROCOUPE YL L4 2.0L 122cid GAS FI N Engine VIN = K
1989 PONTIAC LEMANS GSE L4 2.0L 122cid GAS FI N Engine VIN = K
1989 PONTIAC LEMANS SE L4 2.0L 122cid GAS FI N Engine VIN = K
1989 PONTIAC LEMANS L4 2.0L 122cid GAS FI N Engine VIN = K

198.208.187.182/internet/VehiclePartFits.jsp?autosel=A&part=174-812

On www.rockauto.com/ the Delco one is $250 but there other alternatives, but need to make sure the bore size is correct. quote]

by **surfboardfiller** » Sun 24.02.2008, 19:09

What's wrong with the Unipart BMC Monty?

by **Monty** » Sun 24.02.2008, 20:42

surferphil wrote:What's wrong with the Unipart BMC Monty?

Well if the one on ebay is the same then it`s less than half the price you paid for yours :smt044

So i would think that`ll be a good enough reason :wink:

More alternatives the better

Lotus Elan Central

Brake master cylinder

master cylinder

Brake bleeding

not the master cylinder

Re: not the master cylinder

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