Sent to the list as a direct reply was rejected.
----- Original Message -----
From: "Paul Hunt" <paul.hunt1 at blueyonder.co.uk>
To: "davewillner" <dwillner at ptd.net>
Sent: Thursday, September 01, 2011 8:49 AM
Subject: Re: [Mgs] Brake bleeding question
>I believe so. But if the light comes on under hard braking, but then goes
>off when you release the brakes, there is either some air in one of the
>circuits or the shuttle is very near the switching point on one side. Also
>under normal conditions relatively little fluid will flow into the
>callipers as the pads are kept pretty much in contact with the discs,
>whereas the shoes are pulled back by springs which pushes the pistons back
>into the cylinders when you release the brakes, so fluid has to flow back
>into them to apply the rear brakes. Normally this isn't an issue as the
>rear slave piston surface area is much less then the front calliper area,
>so much the same amount of fluid ends up flowing to the rears as to the
>fronts. However if the rear brakes (shoes and handbrake cable) are poorly
>adjusted, giving a lot of travel, more fluid will flow. Also if a flex
>hose somewhere is expanding under heavy braking again more fluid will flow
>into that circuit. Either of these will cause the shuttle to move, but it
>shouldn't normally be enough to make the light come on, unless as I say
>perhaps the shuttle is near the switching point on one side.
>
> PaulH.
>
> ----- Original Message -----
>> So Paul with a non-servo system then, even with the light off, I need to
>> do a "regular" bleed rear to front with the nylon PDWA nut screwed in all
>> the way, correct? As I mentioned extreme hard braking causes the light to
>> come on momentarily near a complete stop...but its not always on, even
>> with the key turned on, so does that mean the piston is centered now?
|