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AP Racing brake MC


JohnCh
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I replaced both master cylinders today.  The clutch MC had developed a slow leak which revealed itself a few weeks ago when visiting Bruce Beachman's shop (I suspect the Westfield was punishing me).  Whereas the AP Racing brake MC was a planned upgrade.  This is the same MC used by Caterham in the R-spec cars, but with slight differences to the lugs to allow more clearance in the Westfield installation.  Compared to the stock Girling MC, the AP has a much beefier case, slightly bigger bores 60/40 split vs. 50/50 and each MC is individually shimmed to remove all slack.  What a difference!  Firmer pedal and much easier to modulate.  Highly recommended!

 

thumbnail_IMG_2250.thumb.jpg.ff9b4101622cef7905349fbcba0905c7.jpg

 

-John

 

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  • 7 months later...

John,

 

Hope all is well. Would you recommend AP brake & clutch masters for the 1979 I am putting together (a Lotus for Lars). The front brakes are GT-6 and the rears are a Sierra Cosworth disc kit from Motorsport tools. I have 3/16 brake lines and an adjustable proportioning valve. Cross flow is to be approx 140 HP. Trans is Pinto 4sp, that I am going to have built into a "rocket box" w/quaife gears. I am thinking hydraulic clutch is the way to go. Is there a throw out bearing set up you would recommend for this? Part #'s and preferred USA 7's suppliers would be great if you have  them?

 

Have a Happy and Safe New Years,

 

Vin

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I'm afraid I can't be too much help.  That specific AP brake MC works very well in my setup, which has the same rear calipers you mention above, but the fronts are different and may not share the same piston size as the GT6 calipers.  For reference, my front calipers are alloy 4-pots with 1.5" diameter pistons and were designed as a direct replacement for the M16 calipers.  If you do opt for the AP, keep in mind this is not the standard Caterham MC, but rather the upgraded part that is included in the R-pack models and may be a little tough to find. 

 

As for a hydraulic clutch, my bellhousing was designed to work with a concentric slave cylinder.  Someone here may have experience converting a Caterham from that era to hydraulic setup and can steer you towards a known solution.  Best to start a new thread on that topic to ensure people see it.

 

-John

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On 5/29/2021 at 5:40 PM, JohnCh said:

.... when visiting Bruce Beachman's shop...-John

 

My own take-away from this topic is that I would LOVE to visit Bruce's shop.  He has helped me lots, and I'd love to get there, but as we are at opposite corners of the country, it isn't very likely

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Vin

 

I've never seen a pinto 4 speed, but I have bolted a type 9 to a pinto bellhousing, so I assume they're similar.

Pinto bellhousings are weird-they rotate the box a few degrees, but it goes together

Burton has a concentric setup I am going to use-- APC5

with bellhousing BH3

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Thanks for the input on the trans. I figured I would want a lighter weight bell housing, so will source that. Need to get the box built with the Quaife gearset. Hoping someone in the Northeast can do it. Have found some that just want a core.

 

Cheers,

 

Vin

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  • 7 months later...
On 5/30/2021 at 12:40 AM, JohnCh said:

I replaced both master cylinders today.  The clutch MC had developed a slow leak which revealed itself a few weeks ago when visiting Bruce Beachman's shop (I suspect the Westfield was punishing me).  Whereas the AP Racing brake MC was a planned upgrade.  This is the same MC used by Caterham in the R-spec cars, but with slight differences to the lugs to allow more clearance in the Westfield installation.  Compared to the stock Girling MC, the AP has a much beefier case, slightly bigger bores 60/40 split vs. 50/50 and each MC is individually shimmed to remove all slack.  What a difference!  Firmer pedal and much easier to modulate.  Highly recommended!

 

thumbnail_IMG_2250.thumb.jpg.ff9b4101622cef7905349fbcba0905c7.jpg

 

-John

 


John, where did you get the info on the 60/40 split on the uprated AP Master? And are you referring to fluid output or a bore difference? 
 

My refurbished standard Girling started leaking at the base of the fluid container and I don’t think the plastic will survive another removal, so I’m figuring out what my options are.

Edited by Rosteri
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60/40 split is what was widely stated about that MC in Westfield circles, but AP later confirmed to Westfield Parts Dept and a few others that it's actually a 50/50 split. The bore size is 13/16" and the information about shimming comes from AP's site.  

 

-John

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This is the brake master on my 84 cat. Got a rebuilt kit from the UK and just now realized it’s still leaking a little. Very much interested in replacement at this point… :classic_mellow:

3D69B4F4-EC0C-4A22-89C4-713C91CE1D02.jpeg

394C8AD8-DBD7-4EDB-9FE1-CC35220FC307.jpeg

183A6BED-5236-4738-846C-A569E2AC8AAF.jpeg

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