Steering, Suspension, & Brakes

tips, technology, tools and techniques related to non-driveline mechanical components

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geezer
Charles Durning
Magee, MS
(60 posts)

Registered:
11/16/2017 01:16PM

Main British Car:
1974 MGB, 1967 Morris Minor

authors avatar
Re: MGB rear disc brakes
Posted by: geezer
Date: April 08, 2018 02:26PM

Yesterday I had all of the parts and time all in one place. I made a new mock up and test fit the secondary bracket to be used with the more accurate Bob Harper drawing of the Sentra mount bracket. This 240SX bracket moves the caliper in slightly for better placement of the pads. The previous bracket placed the pads even with the OD of the rotor. This bracket places the pads at the outer edge of the contact surface of the rotor. Bob Harper has agreed to create the cad drawing of the bracket also. I will post when it is available. Attached is the more accurate drawings for those who want to go ahead and make their own bracket. One suggestion is to drill the 5th hole once the brackets are attached together on the axle. I was not able to establish a spot on accurate location for that hole. The attached drawing is a tracing from the mock up bracket. All other measurements are accurate.

Another consideration, my CBBGT is lowered by using 5 leaf rear springs and early roadster front springs and it does have a wire wheel rear axle. With 2 people and luggage it does bottom on the bump stop when hitting a harsh bump. Though measurements show adequate clearance it is very close. As a preventative measure I am adding an Energy Suspension 9.9117G to the bump stop on the axle. I'll get better measurements for the 2 CBB conversions I'll be doing in May. Those cars have not been lowered and have bolt on wheels which moves the caliper outboard in relation to the body. No issues are noted with the RBB roadster at normal ride height.
9.9117g  bump stop.jpg
240SX final small1.jpg



Edited 1 time(s). Last edit at 04/11/2018 08:33AM by geezer.


geezer
Charles Durning
Magee, MS
(60 posts)

Registered:
11/16/2017 01:16PM

Main British Car:
1974 MGB, 1967 Morris Minor

authors avatar
Re: MGB rear disc brakes
Posted by: geezer
Date: April 09, 2018 07:50AM

Bob Harper was kind enough to draw up both a PDF and a DXF CAD drawing of the secondary 240SX bracket. The DXF file is laser cutter ready. If anyone wants a copy just PM me your e-mail address and I'll send it right out. I have not commissioned any brackets based upon the drawings, however, the drawings do match my tracings of the prototype bracket.


geezer
Charles Durning
Magee, MS
(60 posts)

Registered:
11/16/2017 01:16PM

Main British Car:
1974 MGB, 1967 Morris Minor

authors avatar
Re: MGB rear disc brakes
Posted by: geezer
Date: April 09, 2018 08:00PM

The question has been asked about increased pedal travel. There is some additional pedal travel though I would not consider the additional travel as disconcerting.

My master cylinder shot craps on me, I was expecting it since it would lose the front circuit occasionally. While I had the system open I took the opportunity to install a pair of 2 psi residual check valves. The valves did make a difference and brought the pedal to almost the original position. I would say try without and see what you think. If you feel the travel is too long, installing the residual valves may be the answer.
residual valves.jpg


geezer
Charles Durning
Magee, MS
(60 posts)

Registered:
11/16/2017 01:16PM

Main British Car:
1974 MGB, 1967 Morris Minor

authors avatar
Re: MGB rear disc brakes
Posted by: geezer
Date: April 11, 2018 03:34PM

I have posted my closing comments on this conversion here

[www.mgexp.com]

Unless there are further questions I am putting this to rest


WernerVC
Werner Van Clapdurp
Lynchburg, Va
(108 posts)

Registered:
09/06/2009 12:56PM

Main British Car:
MGB 1977 Rover 3.5

Re: MGB rear disc brakes
Posted by: WernerVC
Date: February 09, 2019 10:31PM

Charles,
A question about the connections at the brake lines. How did you make the connection from the MGB brake line to the Datsun or Nissan caliper ? One is British threads and the others metric
Werner


Nibor1
Robin Spring

(3 posts)

Registered:
06/28/2021 07:24AM

Main British Car:


Re: MGB rear disc brakes
Posted by: Nibor1
Date: July 01, 2021 04:42AM

Hello Charles I'm new on this site and have just found your post's about disc brakes on mgb and was wondering how thick the mounting plate you made was. Regards Robin


geezer
Charles Durning
Magee, MS
(60 posts)

Registered:
11/16/2017 01:16PM

Main British Car:
1974 MGB, 1967 Morris Minor

authors avatar
Re: MGB rear disc brakes
Posted by: geezer
Date: March 14, 2023 07:00PM

VernerVC, Nibor1,

I apologize, it's been awhile since I visited this forum.

Yes the Nissan caliper is metric. The flex hose I used has a compatible banjo end for the caliper and the other end is -3 inverted flare for a 3/8-24 thread inverted flare nut. The hard line has an inverted (double) flare on the 3/16" pipe.

The primary bracket is made of 3/8" flat steel and the secondary bracket is 1/4". I have positive feedback from one fellow who made the brackets from aluminum.

Hope that helps



MGBV8
Carl Floyd
Kingsport, TN
(4516 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: MGB rear disc brakes
Posted by: MGBV8
Date: March 15, 2023 05:38PM

'I have positive feedback from one fellow who made the brackets from aluminum. That is interesting. I can cut aluminum much easier. I am curious what thickness he used.


MG four six eight
Bill Jacobson
Wa state
(325 posts)

Registered:
10/23/2007 02:15AM

Main British Car:
73 MGB Buick 215, Eaton/GM supercharger

Re: MGB rear disc brakes
Posted by: MG four six eight
Date: March 19, 2023 12:07PM

Carl,

I'm using 1/2" 6061 aluminum for my rear caliper brackets. Different set-up than the OP, with Wilwood calipers on a Mopar rear end but no issues with the brackets at all.
Bill


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: MGB rear disc brakes
Posted by: BlownMGB-V8
Date: March 19, 2023 12:33PM

As a general rule I'd expect that anything over 5/16" should be adequate. Probably the biggest issue is having adequate depth of thread in the aluminum part.

Jim


MGBV8
Carl Floyd
Kingsport, TN
(4516 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: MGB rear disc brakes
Posted by: MGBV8
Date: March 19, 2023 12:57PM

I hadn't thought about threading the aluminum. I am sure y'all would say to use fine thread.


mgb260
Jim Nichols
Sequim,WA
(2465 posts)

Registered:
02/29/2008 08:29PM

Main British Car:
1973 MGB roadster 260 Ford V8

Re: MGB rear disc brakes
Posted by: mgb260
Date: March 19, 2023 01:44PM

Or steel thread inserts. The one who used Charles design probably used the thicker dimension and milled down to the thinner. Anything under 3/8" I'd use steel if 3/8" or thicker aluminum would be fine.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(6470 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: MGB rear disc brakes
Posted by: BlownMGB-V8
Date: March 19, 2023 03:24PM

For lightest weight nutserts would be another option.

Jim


MG four six eight
Bill Jacobson
Wa state
(325 posts)

Registered:
10/23/2007 02:15AM

Main British Car:
73 MGB Buick 215, Eaton/GM supercharger

Re: MGB rear disc brakes
Posted by: MG four six eight
Date: March 19, 2023 04:49PM

Yeah, I forgot to mention that I also installed heli-coils for the caliper mounted bolts.
Bill


Scott68B
Scott Costanzo
Columbus, Ohio
(562 posts)

Registered:
10/25/2007 11:30AM

Main British Car:
1968 MGB GM 5.3 LS4 V8

authors avatar
Re: MGB rear disc brakes
Posted by: Scott68B
Date: March 22, 2023 07:03AM

I used a version of Charlie's design on my rear axle. Works great! Just an FYI, the caliper brackets on the Honda Civic calipers I used are threaded so you don't need thread's in the fabricated brackets, just holes.



MGBV8
Carl Floyd
Kingsport, TN
(4516 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: MGB rear disc brakes
Posted by: MGBV8
Date: March 22, 2023 09:21AM

Thanks for that info, Scott!


geezer
Charles Durning
Magee, MS
(60 posts)

Registered:
11/16/2017 01:16PM

Main British Car:
1974 MGB, 1967 Morris Minor

authors avatar
Re: MGB rear disc brakes
Posted by: geezer
Date: October 10, 2023 12:49PM

I just saw the comments about threading the brackets. None are threaded and I used nuts and bolts. The caliper factory bracket is threaded so that bolt goes through a drilled hole into the factory caliper bracket..

FWIW I did weld the 2 brackets together, along with using the bolts and nuts, just for my satisfaction.


geezer
Charles Durning
Magee, MS
(60 posts)

Registered:
11/16/2017 01:16PM

Main British Car:
1974 MGB, 1967 Morris Minor

authors avatar
Re: MGB rear disc brakes
Posted by: geezer
Date: January 10, 2024 09:12AM

It has been awhile since I have posted here. Just thought I would update this thread. Tim Nagy is now making the brackets for the rear disc conversion. If interested, contact him directly.

Rear brackets available here

morspeedperformance@gmail.com

[morspeedperformance.tgnagy.com]


MGBV8
Carl Floyd
Kingsport, TN
(4516 posts)

Registered:
10/23/2007 11:32PM

Main British Car:
1979 MGB Buick 215

authors avatar
Re: MGB rear disc brakes
Posted by: MGBV8
Date: January 10, 2024 08:08PM

Good to know. Thanks, Charles! Tim, as well. :)
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