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willysmjeeps.com :: View topic - Brake Master Cylinder Mounted to Firewall
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Brake Master Cylinder Mounted to Firewall

 
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CapnDan
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Joined: Feb 24, 2009
Posts: 17
Location: Victoria,Texas

PostPosted: Mon Mar 20, 2023 1:19 pm    Post subject: Brake Master Cylinder Mounted to Firewall Reply with quote

I am looking at installing a dual reservoir master cylinder on my 1954 M38A1. I purchased a kit from rp 4wd about 5 years ago and have never installed it. Back about 10 years ago there was a discussion about dual reservoirs where member vuldub said he had upgraded to a master cylinder mounted to the firewall. Does anyone know how he was able to mount a master cylinder to firewall? Could anyone share how you did it, with a picture? Looking at my 54 M38A1 I don't see enough flat area above brake pedal to mount it. The kit calls for installing the supplied Wilwood cylinder mounted to the inside of the frame with a bracket that requires drilling holes in frame. Wilwood has both firewall and floor mounted pedals, but the firewall does not have enough flat area to mount a through the firewall pedal and master cylinder.

Ref prior subject thread: Dual reservoir master.
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Danny L. Harris
aka Bubba
1954 M38A1
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wesk
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Joined: Apr 04, 2005
Posts: 16049
Location: Wisconsin

PostPosted: Mon Mar 20, 2023 2:31 pm    Post subject: Reply with quote

Here's a few links to folks that have been there, done that:

https://forums.g503.com/viewtopic.php?t=181801

http://earlycj5.com/xf_cj5/index.php?threads/144432/#post-1604134

https://www.jamcosuspension.com/product/universal-firewall-mount-power-brake-conversion-kit-pbbufw

As I recall there is quite a bit of room on the M38A1 firewall with the F134 engine for swinging pedals and a firewall mounted master cylinder.


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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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CapnDan
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Joined: Feb 24, 2009
Posts: 17
Location: Victoria,Texas

PostPosted: Mon Mar 20, 2023 6:25 pm    Post subject: Reply with quote



See picture above, brake pedal comes thru upward angled part of floor board almost directly in line with bend in firewall (recessed area to clear engine), therefore there is no flat area large enough for master cylinder support. You would need a bracket or plate to extend in toward engine past bend to mount to, and cylinder would be very close to engine just above exhaust manifold.
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Danny L. Harris
aka Bubba
1954 M38A1
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wesk
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Joined: Apr 04, 2005
Posts: 16049
Location: Wisconsin

PostPosted: Tue Mar 21, 2023 1:02 am    Post subject: Reply with quote

There are several ways used to overcome the offset needed. Plates and modified offsetting brackets are often used. It has been done on many early jeeps. Most of them use a reinforcing plate across the firewall while relocating the wiring harness firewall hole and plate further to the driver's left. Offsetting bellcranks and brackets is not that difficult.


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Wes K
45 MB, 51 M38, 54 M37, 66 M101A1, 60 CJ5, 76 DJ5D, 47Bantam T3-C & 5? M100

Mjeeps photo album: http://www.willysmjeeps.com/v2/modules.php?set_albumName=Wes-Knettle&op=modload&name=gallery&file=index&include=view_album.php
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