While I was bleeding my brakes once I noticed that my brake master cylinder has a lot of movement when pressing on the brake pedal hard. The firewall flexes where the assembly bolts to it. So the next time my shock was off and I had access to the strut tower on the wheel well side I was going to do something about it. That time is now.

I made the bracket out of 1/4" 6061-T6 plate. The adjuster bolt is 3/8"x24 fine thread. I put a bit of preload on the brake master cylinder, maybe 1/2 turn after contact.

Here are some pics of it installed. It simply bolts to the strut tower with three 8mm bolts. Two of the holes were already there, I just had to drill one hole.







After I installed it, I took some videos. The first video shows the bolt backed off to show how much the brake master cylinder flexes under hard pedal pressure.

The second video is with the bolt adjusted up against the end of the brake master cylinder. You can see the flex is significantly minimized. I'm surprised it even moves at all, but I guess there is a lot of force going on that pedal, then through the mechanical advantage of the pedal/master cylinder pushrod assembly.

Oh this third video is I added one more turn of preload. All the deflection looks to be pretty much gone.

 

Kevin,

I like the fact you wrapped the corner of the shock tower. I've seen a bunch of these (hell I aleady build one myself) but the shock tower flexs a lot when you only use the two OEM holes so your version is definitely an improvement.

-Joel

 

this is awesome. the welding looks great, and im surprised the cylinder moves that much...

 

Agreeed. THat is some pretty good work. Do all the welding yourself?

 

Yep, all welding done by me.

 

You should see the awesome trailer he made, thing's a work of art.

 

Nice work.

Would the head of the bolt against the soft aluminum body of the master cause an issue over time? Might be a good spot for a delrin pad in between.