[Spridgets] Master Cylinders

Rick Fisk refisk at chartermi.net
Mon Apr 18 05:43:40 MDT 2016


Guy,

It's mentioned in this thread at about post 53.  I've heard it other places too.  Manufacturers mentioned that don't like silicone brake fluid are TRW and Delphi.  Little fly-by-night operations.  

http://www.mgexp.com/phorum/read.php?1,3161136,3165850#msg-3165850

Master cylinders are indeed simple pumps - simple pumps with seals and some seals apparently don't like silicone.   

Sent from my keyboard

> On Apr 18, 2016, at 4:03 AM, GUY DAY <grday at btinternet.com> wrote:
> 
> Rick,
> You said <snip> 'And I've heard that some of the currently available new master cylinders come with a proviso in their warranty stating that the warranty is void if silicone fluid is used.'  <snip> perhaps you could be more informative and say which new master cylinders have this slippery warranty avoiding comment?  It would appear to be a very poor quality master cylinder that can't use it and I wouldn't like to avoid using such dung forged cr*p.
> However, if the master cylinders are to be used with an ABS system this would be right as silicone viscosity is such that ABS struggles to cope with the restitution phases at 32hz plus. 
> 
> A master cylinder is a pump, plain and simple.  If they are not pumping they are faulty.  If they have been just been re-sealed by one person there can be a problem in how the seals are located or positioned and if it is happening to both master cylinders it would suggest something as drastic as having the main seals the wrong way round!  The limiting pressure in the clutch may support this thought.  Without more information it is hard to comment.
> 
> Guy R Day
> 
> 
>   
> 
> 
> 
> On Monday, 18 April 2016, 2:13, Rick Fisk via Spridgets <spridgets at autox.team.net> wrote:
> 
> 
> Hi Bob,
> 
> Everyone else must be out driving their cars.  Or out in the garage working on them.  :-)
> 
> I would not bother trying to rebuild the master cylinders.  Replace them with new components.  Much less hassle and a better chance of success.  You've already replaced the Bugeye stuff with later components so you don't have to worry about originality.
> 
> That said, I would also use regular brake fluid.  I've never cared for the silicone stuff.  And I've heard that some of the currently available new master cylinders come with a proviso in their warranty stating that the warranty is void if silicone fluid is used.
> 
> Rick
> 
> Sent from my keyboard
> 
>> On Apr 17, 2016, at 4:19 PM, Bob Kitterer via Spridgets <spridgets at autox.team.net> wrote:
>> 
> 
> OK, I am at my wits end tiring to get the hydraulics to work.  So who / where should I go to get the master cylinders rebuilt which may mean reboring.  I have separate masters for the brakes and the clutch, early Sprite MK IV.  Also am using silicon brake fluid.
> 
> Recently honed and put new seals in both masters, brake and slave cylinders and disk calipers.  Am getting no fluid movement in the brakes.  Have fluid in the clutch slave but not enough pressure to move the slave cylinder.  The clutch slave has Gerard's remote bleed valve an fluid moves through this valve with no air.
> 
> 
> Bob  Kitterer
> 
> 1960 Austin Healey Sprite (Mk IV in disguise)
> 1966 Austin Healey Sprite Mk III (Trevor) - still in boxes
> 2013 Miata
> 
> Pay it Forward
> Thanks Frank
> 
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