Front disc brake conversion

67dubcab · Posted: Mon Jul 21, 2014 8:53 pm Post subject: disc brake conversion

DerrickfromNC1,
You are so close to having awesome braking power, I would keep going with the matching 944 na components, get the rear discs on and bolt in the stock 944 master cylinder. Put on some performance street pads and with some sticky tires you will stop faster than most modern cars.
I ran this set-up in a earlier version of my double cab, steel 944 rear arms, welded 944 spindles and 944 m.c. from the same car, even the e-brake worked with swan adapters. All original Porsche and no after-market or mis-matched components.
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wrenchnride247 · Posted: Wed Jul 23, 2014 8:37 pm Post subject:

I have four wheel disc set up off '87 944 NA, Hybrid spindles from Old Speed up front, '68 tubes in back with '84 944 NA backing plates, All 944 to the dust shields, and late bay MC. I did the bleed til no bubbles on all for, and the pedal is very firm. However, ran into a engine case issue. and waiting to get it back from machine shop...so, no seat time on brakes yet.
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'62 SC 69x90.5 SP TI
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DerrickfromNC1 · Posted: Thu Jul 24, 2014 4:48 am Post subject:

It seems to me that to get the most from a 944 disc brake swap that you need a boosted mc like a 944 or a smaller bore mc to get better pedal(leverage) as discribed by 55samba. I will report back after I install the rabbit mc which can be had for less that $50. I already have the rabbit reservoir on my Bay mc.

brettsvw · Posted: Thu Jul 24, 2014 4:37 pm Post subject:

By design disc brakes work better with a booster. Especially with heavier vehicles.

Drum brakes are designed to use the rotating drum as the booster. As the pad moves out the drum grabs the pad and pulls it into the drum. That is why the drum pads wear more on the end that's pulled towards the drum.
The top area of the forward pad and the bottom area of the rear pad is where you see the wear.

Ghia's with factory disc are designed without a booster and the only noticeable difference in braking is the lack of maintenance.

When comparing a Ghia to a bus. VW must of knew something when they went with a booster.
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http://www.thesamba.com/vw/forum/viewtopic.php?t=289807

67dubcab · Posted: Thu Jul 24, 2014 8:46 pm Post subject: disc brake conversion

Having driven (hard) the 944 n.a. brake system-stock except for the lack of the booster, I did not feel the need for the booster, as I liked the pedal feel and thought the pedal pressure was not too high.
I am now running the 944 turbo Brembo 4 piston brakes, still all matching (front and rear calipers, rotors, and master cyl.) except the booster.
I feel this set-up could use a booster as pedal pressure is a bit high but do-able. I have about 5000 miles of daily driving with it.
I will likely go with a remote booster in the future.
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AirBus · Posted: Thu Jul 24, 2014 11:53 pm Post subject:

Image may have been reduced in size. Click image to view fullscreen.

Running 944 N/A in front and rear + external booster for dual circuit...

wooow! brakes very good.. Cool

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nigel naughton · Samba Member Joined: October 31, 2001 Posts: 122

Your brakes look nice. What rims are you running? And does anyone make a double jam nut replacement? similar to late models? I thought I saw it somewhere once.

DerrickfromNC1 · Posted: Fri Jul 25, 2014 10:25 am Post subject:

srfndoc · Posted: Fri Jul 25, 2014 10:33 am Post subject:

Correct, the Bay window part will work for late model splits (64-67). CIP1 has them:

https://www2.cip1.com/ProductDetails.asp?ProductCode=VWC-211-405-670
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AirBus · Posted: Fri Aug 01, 2014 5:53 am Post subject:

DerrickfromNC1 · Posted: Wed Aug 06, 2014 3:11 am Post subject:

Rabbit MC installed and a diffinite improvement over the Bay MC interms of pedal feel. However the pedal stroke for full brkae ingagement is probably 1/2-3/4 of total pedal travel. I think I will live with it until I make the 944 disc brake conversion in the rear over the beetle brakes and see what happens. I expect that will shorten pedal travel.
Over the winter I will experiment with possibly adding 2psi residual valves and/or trying a 944 MC.

panel · Posted: Thu Aug 21, 2014 6:18 pm Post subject:

Anyone have the p/n for the 944 NA disks? Or a pic/dimensions? I have a couple of styles of disks at home and no p/n. I'd like to do some measuring before installation.
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easy e · Posted: Sat Sep 20, 2014 12:50 pm Post subject:

jvogen · Posted: Tue Feb 10, 2015 8:32 pm Post subject:

Just got my 944 setup. Should fit in nicely with the 901 5 speed in my 63 cal look camper. Anyone using phone dials on their bus? I have a set that came with the brakes but I'm worried about clearance. My bus is pretty low.

dawerks · Samba Member Joined: September 15, 2010 Posts: 2349

Is there a disc rotor that fits early bus spindles?
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Daddybus · Samba Member Joined: June 15, 2000 Posts: 1653

With bug rear drums you are mostly stopping with the front brakes. You need the bay MC for front disc/rear drum brakes, not the early bay MC for 4-wheel drums. I run a '67 bus MC. I have 4-wheel disc brakes. I would use a 944 MC with a rabbit reservoir if I need to replace the MC.

jvogen · Posted: Wed Feb 11, 2015 8:25 pm Post subject:

55samba · Posted: Thu Feb 12, 2015 2:04 am Post subject:

flemcadiddlehopper · Posted: Sat Feb 14, 2015 1:24 pm Post subject:

Here are a few...pricey though.
http://www.wagenswest.com/partstore/index.php/disk...e-kit.html

http://www.wagenswest.com/partstore/index.php/disk...m-oem.html

http://vintagev-dubs.com/shop/55-79-bus-high-grade-disk-brake-kit/

And this little article, although for a bug, lots of good info if you want to piece together your own kits and save some $$$.

http://www.volkspower.nl/tech/944brakes/944brakes.php

Gordo.
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jvogen · Posted: Tue Feb 17, 2015 8:03 pm Post subject: master cyl?

Whats the best master cyl to use with the 944 disk brakes (front and rear) on my 63? I've heard others say a rabbit master, or late bay. Is there a kit or do I need to peice together my own?
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66 Riviera pop top
63 ragtop bug
65 Panel


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Front disc brake conversion
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