Hi guys I have a UC Torana hatch I am restoring it has disc brakes all round and the brake cylinder has seen better days it is a big nut PBR P7374 cylinder there is a rebuild kit you can by for $200 and then you have to re-sleeve the cylinder. Personally I think it would be much more cost effective and less time to just by a new cylinder which does the same thing or better. Has anyone got any suggestions for a replacement cylinder for the big nut ones that is just as good if not better?
Uc Torana Hatch Big Nut Brake Cylender PBR P7374
Started by
_FPVETR_
, May 03 2014 07:56 PM
11 replies to this topic
#2
dattoman
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Posted 03 May 2014 - 08:06 PM
P7470 was the replacement for the all alloy 4w disc master
But usually on a UC with 4w discs you got a plastic bottle master which is the Commodore one P10220
These do not interchange as the front can of the booster is different to allow the diagonal mounting
Big nut cylinders weren't genrally produced by PBR so its either a big nut cast cylinder or an aftermarket alloy PBR (usually)
Where did you come up with the part # ?
#3
_FPVETR_
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Posted 04 May 2014 - 03:52 PM
Hi Neil it is definitely a big nut cast iron one. The part number I got from the rubber cap seal said genuine PBR P7374. The car is a 1978 model one of the earlier UC Torana's with PBR discs all round and big brake booster, could not find a number on the booster just said PBR Made in Australia. The number on the big nut is 26E8P 4 WHL Disc. Do you recommend I use a P7470? This is my third UC over the years but the only one worth restoring and it really has me stumped.
#4
dattoman
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Posted 04 May 2014 - 05:56 PM
Ah
The part # is just for the rubber lid seal
You only need the $200 repair kit if your pistons are corroded and can't be re-used
If they are good you can just rekit the cylinder using $20 worth of rubbers.... or worst case sleeve the bore in stainless then rekit
Infact that lid seal is the most expensive part of the rebuild if you don't need sleeving
I've had to use that full kit twice for cars with badly corroded cylinders... but 8-10 times you won't need it.
#5
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Posted 04 May 2014 - 08:09 PM
Thanks for that info mate, I will do that it just has a leak in the usual place but otherwise works fine. You wouldn't happen to know the correct part number or where to order the seal kit without the piston?
#6
dattoman
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Posted 04 May 2014 - 11:04 PM
If your lid seal is OK I think the part #'s are P5473 for 2 or and P5444 for 3 of
Any decent brake shop should be able to help
Or Perth Brake Parts if you can't find one of those 
#7
Steve TPF
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Posted 04 May 2014 - 11:19 PM
Hi guys I have a UC Torana hatch I am restoring it has disc brakes all round and the brake cylinder has seen better days it is a big nut PBR P7374 cylinder there is a rebuild kit you can by for $200 and then you have to re-sleeve the cylinder. Personally I think it would be much more cost effective and less time to just by a new cylinder which does the same thing or better. Has anyone got any suggestions for a replacement cylinder for the big nut ones that is just as good if not better?
http://www.sunburybr....au/prod797.htm
"
Holden TORANA BRAKE MASTER CYLINDER UC Models 3/1978 to 6/1979 P7369
Disc/ Disc Models "
I got my all-disc master cylinder off Ebay - shouldn't be hard to find.
#8
dattoman
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Posted 04 May 2014 - 11:20 PM
7369 is drum rear
But its easy to make it 4w disc
#9
_FPVETR_
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Posted 05 May 2014 - 06:15 PM
Thanks guys I will go to auto one tomorrow and see if they have those parts and use P5473 and or P5444. I will let you know how I go tomorrow. Thanks for the advice.
#10
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Posted 09 May 2014 - 06:46 PM
Hi Guys thanks for the help. I went to Auto One (waste of time) but Perth brake parts were very good and are reasonably priced. The code for the big nut cylinder is P7369RI
#11
dattoman
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Posted 09 May 2014 - 08:39 PM
Hope they set it up for 4w discs
7369 is a disc/drum
#12
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Posted 10 May 2014 - 01:10 PM
Yeah they said they can arrange it to fit 4 wheel discs I just have to let them know when I drop it off. Thanks for the help it is much appreciated.
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