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How to tell GT6 brakes apart?


vraksianrebel

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I have a spitfire 4/1500 fitted with a 2.5ltr straight six engine, when i bought the car last year i was told that the front and rear brakes had been upgraded to GT6 spec ones, sadly the brakes have failed miserably in the MOT so i am going to rebuild them and replace all the pads, discs, shoes pistons and brake cylinders.
My concern is how to tell exactly which GT6 brakes i have, i need to figure out exactly what i need for the front and rear brakes so hopefully i can get it all back on the road as soon as possible.
thanks for any help guys
Matt

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Hi Matt.

The previous owner will have fitted the uprights (vertical links), stub axles, hubs,steering arms, discs and calipers straight off a GT6 onto your spitfire as thats the straight forward bolt on upgrade.

You will have imperial type 16 P or the metric 16 PB, it will say on the side of the caliper here:



You will need standard solid gt6 discs unless it has vented discs fitted which are probably from a Capri 2.8.  

The rear brakes will probably be standard spitfire, but may have had GT6/1500 larger cylinders fitted, you wont know until you strip them down.

The master cylinder may have been changed for the slightly larger bore GT6 one too. (it will have 5/8 on the side of the master cylinder if its a spitfire one)

Can you post some pics?
Gaz

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Quote:
The previous owner will have fitted the uprights (vertical links), stub axles, hubs,steering arms, discs and calipers straight off a GT6 onto your spitfire as thats the straight forward bolt on upgrade.

You will have imperial type 16 P or the metric 16 PB, it will say on the side of the caliper


What it says on the casting does NOT indicate the type.

What you need to check is:

The type of dust seal:
16P use bellows seals that do NOT have a retaining ring/spring.
16PB/M16PB have a smaller seal held by a retaining ring/spring.

And, the retaining pins:
16P use large (1/4”) retaining pins
16PB/M16PB use smaller (3/16”) retaining pins.

Bleed nipple heads
If 10mm hex = inconclusive
If 7/16” AF hex = 99% sure not M16PB


If 16PB/M16PB, then:
Pads GBP144 or substitute (may need filing to clear)
Repair Kit 519731
Pad fitting kit (if required) GBK1002

If 16P
Pads GBP144 or substitute (may need drilling and/or filing)
Repair Kit 601960


See also http://club.triumph.org.uk/cgi-bin/forum10/Blah.pl/Blah.pl?m-1253348427/s-15/

C.

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