Jason Wenger
Active Member
Anything worth doing is worth overdoing.
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Hydraulic master cylinder - Firewall flex solved
- Thread starter Jason Wenger
- Start date
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Anything worth doing is worth overdoing.
19Greg69
Member
Outstanding job!!!!
Nice solution. The factory power brake setup had two or three braces that went to the firewall and inner fender. I can tell you, without them the master cylinder moves about 1/2" left and right with each pedal push. Wouldnt take long for the firewall to crack.
moparmat2000
Well-Known Member
That looks great. I could see you being able to make and sell quite a few of these
Magnum Valiant
Well-Known Member
Magnum Valiant
Well-Known Member
Did you cut a hole for the clutch MC, or was it already there, speedo cable?
Jason Wenger
Active Member
Hah! Took me more than a day, all hand work. -- Need to add a photo, the back side required a couple hours of careful slow grinding to match the profile of the firewall. Can't imagine that's quite the same for any two cars in the same year, let alone generically. It'd be tough to produce in bulk.
Jason Wenger
Active Member
Yes, used the same hole saw I used to make the hole for the clutch master cylinder in the plate in the bracket. There's about an inch of the master housing that sticks out past the mounting plate, so the hole in the firewall has to be big enough to clear the master and the rubber boot, not just big enough for the pushrod alone. That's another reason I wanted the bracket like this, making so large a hole in the firewall, I wanted it sealed up.
The firewall there has part of the bend, so it's not a hole through a flat section of firewall, but it's the only place you can do it. I still like this a lot better than putting the clutch master through the firewall hole for the clutch throwout pushrod, which requires the cylinder to be very low, and at a very steep angle and also to interfere with the wheelwell. I couldn't see any way at all to make it fit that way in fact.
The manufacturer says you want a 6:1 pedal ratio, so that, based on the geometry, requires the centerline of the clutch master to be about an inch lower than the centerline of the brake master. Hence the dogleg shape. Now let's just hope it actually works out.
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Yeah, I imagine that'll do it! Nice work!
Well done! If anything you have shared a solution to a common problem.
Jason Wenger
Active Member
'76 Duster
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