Steering, Suspension, & Brakes

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

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geezer
Charles Durning
Magee, MS
(41 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
(41 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
(41 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
(41 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
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