|
|
Post by johnbirmingham on Jun 24, 2009 21:17:45 GMT
Oooo Phil, don't encourage folk to see the vac reservoir as superfluous. It's there to give you 2 or 3 assisted stabs at the brakes if the engine dies. Using the brakes without servo assistance is quite alarming ! John. (Still using points )
|
|
|
|
Post by Phil Nottingham on Jun 24, 2009 22:09:16 GMT
Rover belt and braces and even they fitted them on on off throughout from when servo brakes were first used on P4's in the mid 1950's - very few other car makers fitted them at all with either the identical Girling or Lockeed servo's as it is another maintenance issue which gets overlooked - they fill with water condensation (how many drain it off?) and corrode leaving no power brakes at all - it only gives another 2 applications anyway and adds little practical effect to safety on balance and no modern car has them
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Jun 25, 2009 6:54:18 GMT
MK II & III don´t have any servo reservoirs.
Regards
Lars
|
|
|
|
Post by tomcgn on Jun 25, 2009 10:15:15 GMT
indeed they dont I drove a Mk2 saloon for some years and I never noticed any difference.
first a new servo has to go in and I'll take it from there. but its good to bear in mind that this reservoir can be a source of trouble...
more news in about 2 weeks...
|
|
|
|
Post by Warwick on Jun 25, 2009 23:42:38 GMT
Why did they put it back for the V8?
They obviously didn't think it was necessary on the Range Rover which was much heavier and had discs all round so is even more reliant on power assistance. Probably Leyland cost-cutting.
I can't think of another car that used them.
|
|
|
|
Post by enigmas on Jun 26, 2009 1:58:22 GMT
The vacuum brake reservoir is not superfluous...John's on the right train. Rover engines are fairly staid machines producing high vacuum at idle. Vacuum reservoirs are specifically required for engines producing low vacuum signals...more so for performance engines with radical camshafts. I ran a twin cam MGA engine in my Magnette many years ago (brake booster fitted) and the brakes at the time were quite scary (no boost provided unless there was a strong vacuum signal ... only on the over-run). The problem was easily solved by fitting a vacuum tank from a Jaguar.
The tank is a reservoir for vacuum providing the vehicle with several applications should the vacuum source 'disappear' for some reason. E.g. engine cuts out. Imagine this in an automatic vehicle going down hill. Of course this may never happen until it happens to you! I suppose the engineers at Rover added this as an extra safety feature.
Modern cars also have dual circuit brakes & ABS (other safety features) and tend to use large brake boosters which provide the volume of a reserve vacuum tank.
|
|
|
|
Post by Warwick on Jun 26, 2009 8:30:42 GMT
I had the belt-driven vacuum pump on a 505 diesel break its big-end years ago. That was a bit hairy. Not a really heavy car but 4-wheel discs, so it took some pulling up.
|
|
|
|
Post by tomcgn on Jul 13, 2009 20:05:04 GMT
The vacuum brake reservoir is not superfluous...John's on the right train. Rover engines are fairly staid machines producing high vacuum at idle. Vacuum reservoirs are specifically required for engines producing low vacuum signals... isnt this a bit contradictory? if Rover engines produces so much vacuum why have a reservoir? as I said earlier, I had a 3 litre without it and I didn't notice any difference. and the 3 litre is even heavier than the 3.5... |
|
|
|
Post by Phil Nottingham on Jul 15, 2009 16:16:32 GMT
The vac reservoir of the Servo is adequate for 2 or 3 applications - the unassisted brakes must by law in the UK still stop the car within minimum distance should the servo fail. Rover did add for an extra safety feature - not many cars had this though
|
|
|
|
Post by tomcgn on Jul 20, 2009 17:24:37 GMT
the latest developments... I fitted a new servo, which went easy enough, every thing coming apart easily etc.
unfortunately the new servo didnt provide the solution to the ignition problem. I tested the reservoir (which also has a non-retun valve btw) and it was fine.
In order to establish whether the cause was really the ignition or something else I put the old distributor back in again. Things improved in the sense that the engine didnt stall when selecting gear. so one thing is certain: this stalling is a problem in the electronic distributor.
it somehow doesnt advance when the engine is under load.
Just asked JRW for any advice...we'll see what that brings....
|
|
