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Re: Frozen Brake Caliper
Posted by David Prantl (more from David Prantl) on Sun, 24 Dec 2000 14:24:33
In Reply to: , Kok Chen, Sat, 17 Dec 1988 12:00:00 

>  Although this is a 'floating caliper' design,  it has two pistons, one 
>pointed in each direction, and the caliper bore is clear through.

Um, no.  The pre-'88 900 brakes are of a 'fixed caliper' design, both front 
and rear.

The rears are easy to understand, since there are no moving parts other than 
the pistons and pads, i.e. there are two direct pistons, each pushing a pad 
at the rotor.

The fronts are somewhat misleading, since there is a floating component in 
them.  The caliper is still 'fixed', in that the caliper body is firmly 
bolted to the hub and does not move.  The direct piston pushes towards the 
inside of the rotor, while the indirect piston pushes on the outside of the 
rotor by means of the sliding yoke.

I remember when John Moss recently held one of these yokes in his hand and 
said something like:  'I look at this, and think, what the hell were they 
thinking !', followed by 'Must have been the cheapest thing Girling had at 
the time...'

9k (and '88+ C900) brakes are all floating caliper designs, front and rear.  
Slider pins are bolted to the hub (or the pad carrier that is itself bolted 
to the hub), on which the caliper slides so that it's single piston can 
simultaneously push and pull on the inside and outside pads respectively.  
Excellent compact design, that eliminates the need for 'deep' rotors, and is 
used by practically ALL passenger cars, vans and light trucks today in 
single, double, or multiple piston configurations.

David Prantl
david_prantlno39sdcx6spamx782hotmail.com
'84 900S, 5M, 210kMi, RIP
'86 9000T, 5M, 182kMi
'88 9000S, 5M, 142kMi
'90 9000S, 4A, 133kMi
'93 9000CSET, 5M, 64kMi
'89 900, 3A, 115kMi
'68 97 Sonett V4, 76kMi, #000467
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