how's it going everyone i'm Landan with LMR.com today's video we're
going to be talking about some simple tech info
where we'll show you the steps that you need to take to adjust your brake booster push rod
all right so recently we installed a 93 cobra style brake booster into our 93 silver hatchback
which does have our spe sn95 cobra style 5 lug conversion now i'm not going to go
into great detail of that particular kit but if you are interested check out the video in
the description where we explain the kit in its entirety and of course install one of those kits
into a fox mustang upgrading the brake booster has led us to this video anytime you install
a new master cylinder or a new brake booster it is required that you verify and adjust the
brake booster push rod length not doing this will result in either dragging brakes or a low pedal
both of which can be very dangerous in this video we're going to explain the very simple steps
that you need to take to ensure the brake booster push rod is properly adjusted now you can purchase
a specific tool for this if you want to have it in your arsenal or you can use what you have laying
around the shop other than the obvious tools to work on vehicles you will need a few specialty
tools to do this which include a digital or dial caliper a small straight edge and a set of small
wrenches now i know a vernier caliper can seem rather simple but you will need to understand
how one of these calipers work in order to obtain some of these measurements to ensure we are clear
and concise we are going to be showing these steps on the workbench to begin we first need to measure
the push rod bore depth of the master cylinder and write this down this measurement will be from
the bottom of the radius and the push rod bore to the back face of the mounting flange on the master
cylinder insert a tool that will fit inside of the bore and is small enough to reach the lowest
point in the bore next use a small straight edge and position it across the mounting flange of the
master cylinder using a marker place a mark where the straight edge intersects with the
depth checking tool remove the depth checking tool and measure the distance using a digital or
dial caliper you'll use the lower jaw section on the caliper for this measurement write down this
number and call it something you can reference for example i'm calling this m1 for measurement one
now we can go ahead and measure the distance from the back of the master cylinder to the
back face of the mounting flange use the depth rod section of the caliper to obtain this measurement
write down this number i'm calling this m2 for measurement two
go ahead and subtract m2 from m1 and write this down as m3 in order to prevent accidental preload
of the master cylinder subtract another 5 to 10 thousandths from m3 this will be the final number
go ahead and measure the distance that the pushrod protrudes from the master cylinder mating surface
on the brake booster to the tip of the push rod use the upper jaw section on the caliper
to measure this distance depending on the components and how the pushrod is set from
the factory will dictate whether or not you have to lengthen or shorten the push rod whatever
is required hold the flats on the shaft with a suitable small wrench loosen the jam nut using
the correct size wrench and then turn the push rod adjusting screw in or out to the desired length go
ahead and check the length again whenever this is good place a mark on the tip for reference
just in case you accidentally rotate a little you'll know where the orientation was run the
jam nut down against the shaft and then snug it down this doesn't have to be crazy tight once
that is complete you can continue with what you're doing and you're good to go all right folks that's
it this process is definitely a lot easier than what people make it out to be the hardest part of
this is no doubt about it installing these two components right here into the vehicle
which by the way if you own a fox mustang and would like to see the process of installing
a 93 cobra booster check out the link in the video description that's going to wrap things
up here guys as always for the most up-to-date information on anything you saw in the video
please reference the video description or LMR.com if you appreciate and value our tech videos
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to present mustang and svt lightning keep it right here with the real enthusiasts LMR.com