Peter is, of course, totally correct. The MGA disc brakes were very
early in disc brake design and they thought that the pistons had to be
spring loaded like a drum brake to return them to the original
position. This was not the case and actually it is a mildly unsafe
design because there is a lag in braking to make up that extra distance
that the piston must travel. Some have found that they need to pump the
brakes quickly to make them as effective as they should be. Using MGA
pistons, therefore is not only more expensive, but less safe.
I have MGA disc brakes on my TD with MGB pistons in them and the car is
very much safer than with the original drum brakes up front.
I think that I put the cutout toward the hub.
Charlie
On 3/15/2011 3:51 PM, Peter Caldwell wrote:
> Ed... be quiet. It is common and accepted to use B pistons for A
> calipers. Lockheed was misguided in the original design with the
> center pin.
> Peter C
> =
> At 02:37 PM 3/15/2011, Shop at \" Just Brits \" wrote:
>> << I am changing over my MGA pistons to MGB pistons (much
>> cheaper)... >>
>>
>> Are you actually telling us that in the relaxed and NON-EMERGENCY
>> situation you are in Mark, you are with malice & forethought going to
>> "play" with a *SAFETY* item ??
>>
>> If *BRAKE* caliper pistons are *SO* expensive for you, then IMNSHO it
>> IS time to SELL the car.
>>
>> Normally when someone does something like that and the "alteration"
>> is only something that could effect the Owner, I say
>> "hope your hospitalization/funeral policies are good & will cover
>> you in case of a violation discovery.". In this case, you could very
>> will effect the LIVES of yourself AND others. *
>> RE-READ Para. # 2.
>>
>> *Ed*
>> *
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