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Post by canuck on Aug 28, 2023 21:42:24 GMT
Would one of you provide me with the bore diameter of the Girling™ Brakes master cylinder? I believe this to be part #BCA4090.
I am sure the Girling™ master cylinder has the bore diameter cast into the body but even with a stick mirror I am not able to see the side of the casting . Add the carburetters, manifold and air cleaners etc., (joys of LHD car) to the mix and pretty much impossible to see.
Thanks in advance
Bruce
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Post by tonyhosk on Aug 28, 2023 22:48:13 GMT
Hi Bruce
Just been out to the garage. Can't see much on the master cylinder in the car - lots in the way with a RH drive one as well! However, I do have a new 'spare' aftermarket one on the shelf and that has 3/4 present on both sides of the reservoir, so 3/4" bore it is. When I read your post, I immediately thought 3/4", so must have read it somewhere.
Tony
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Post by canuck on Aug 29, 2023 13:36:59 GMT
Thanks Tony, you are the best. I thought this was 3/4" as well but needed verification. My master cylinder has decided to no longer produce pressure. I will either install a kit or have the old master sleeved. This sleeve may be worth it, being the the original casting that I kitted 14 years ago. Pretty good life and with only one flush of fluids in that time says volumes about reliability I should think. Kits are readily available over here just needed size as these Girling™ do vary in bore diameter. I do not have fond memories of removal of the cylinder, Fiddling about under the fascia with the lower bolt/nut and spacer was a two person job? I may need to employ the wife to hold the spanner at one end. Yikes, wish me well. Salut B
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Post by vue from the north on Aug 29, 2023 17:11:54 GMT
hope it just the rubbers that have perished, mind you to last 14 years is a good effort
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Post by vue from the north on Aug 29, 2023 17:12:09 GMT
hope it just the rubbers that have perished, mind you to last 14 years is a good effort
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Post by cygnet61 on Aug 29, 2023 21:11:05 GMT
BCA4090 cross references to Girling part number 3112354W which has a bore size of 3/4 inch.
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Post by canuck on Aug 31, 2023 13:03:03 GMT
I have confidence this is just the rubbers. I investigated each wheel cylinder and brake lines & hoses joint for leaks and all is dry and sound. New rear brake shoes are in the near future. Gordon, I appreciate the cross reference number to the Austin application. These Girling parts were/are widely used. Conveniently I am about to install a disc brake conversion, so this master cylinder failure is telling me a brakes system overhaul is well timed. Thanks Bruce
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Post by tonyhosk on Aug 31, 2023 20:30:16 GMT
Do keep us informed of how it goes.
Tony
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Post by canuck on Sept 1, 2023 16:28:49 GMT
So a few hours truancy from work and I have the master cylinder on my bench. For easier access to the fasteners I did remove the carburetters from the engine. Yikes the nut for vacuum hard line is a bugg*r to get at. My memory failed me, (surprised? ) as there is no need for fiddling about under the dash, everything except the pivot/split pin at the pedal comes out from the engine bay side. The bore looks great, the main seal looks a tad tired. With a light hone of the bore and the new kit, when it arrives should see me good to go! Question; is the rubber boot at the pushrod end a tight fit to the hole in the car body? I needed to tug quite a bit to remove the cylinder in the engine bay side. Bruce
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Post by canuck on Sept 1, 2023 17:56:11 GMT
Another query gents.
The piston in my Master Cylinder appears to be different than what I am seeing on line, however agrees with the parts list.
The pistons I see on line have a 'solid' piston. In my cylinder, the piston has a groove, approximately 1/8" wide for another seal. This groove is approximately 1/8" from the outer end.
The factory parts list I have calls up, quantity 1, seal, taper, plunger #17H4188. My cylinder currently does not have this seal in place and I simply cannot remember when I did the rebuild all those years ago. The rebuild kit I have coming, I just noticed does not have this seal, All the available kits I find on line do not show this seal to be included either. Ughh!!
I am quite sure this is the OEM master cylinder. So chaps I need advice, do any of you have the same piston as I do ? knowledge of a kit that includes this seal? do I put it back together without this seal? is that what you did?
Thanks in advance Bruce
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Post by canuck on Sept 1, 2023 21:26:00 GMT
OK chaps I think have my answer.? I looked at other vehicle applications and have fallen on a solution? I will simply need to buy another kit to get that 1 piston seal I want. Look at Moss #583-081. mossmotors.com/583-081-repair-kit-brake-clutch-master-cylinderThis is a (Triumph TR4 clutch?) application kit and shows the seal for the piston. Look at Moss #583-780, mossmotors.com/583-780-repair-kit-master-cylinder-3-4-borea complete kit but doesn't show piston seal . I didn't buy my kit from Moss but what I purchased looks like the TRW #583-780 kit. 'Mix n match' why not? This may serve some of you chaps ? Or is there an all inclusive kit available? Bruce
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Post by canuck on Sept 3, 2023 20:11:30 GMT
One more bit of help I need.
Between the master cylinder flange and the bulkhead where the cylinder bolts on there is a spacer called up on the parts list. I believe this spacer helps to align the cylinder flange and to keep it plumb?
I had used washers my last time around as my spacer seems to be missing in action?
So do any of you have spares of these I can buy? Provide me with the thickness so I can make fabricate some?
Thanks Bruce
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jA40
Junior Member
Posts: 67
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Post by jA40 on Sept 4, 2023 13:35:46 GMT
They appear to 4.5mm thick Bruce. No doubt 3/16" when new.
Happy sawing & filing!
Jeff
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Post by canuck on Sept 4, 2023 18:28:15 GMT
Thanks Jeff, Fortunately I have a bit of flat bar alloy 3/16" thick. and a 1.5" hole arbor so I am not daunted. Do you have any idea what the ultimate purpose is? Is this to simply distance the cylinder from the bulkhead? Are these used on top fastener flange only? or the complete fixing flange. is this intended to align or maintain plumb? I had a stack of washers in my car for last 14 years. Yikes! The current fixing studs look to be just long enough to be used with a 3/16" thick spacer. Thanks again B
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jA40
Junior Member
Posts: 67
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Post by jA40 on Sept 5, 2023 9:43:03 GMT
To be honest Bruce, I failed determine their purpose so have not re-fitted them.
It does result in the pedals being raised slightly, which is no bad thing in my opinion. I'm open to anyone to correct my decision.......
Jeff
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