Fitting E32 Master Cylinder - Revision history

Grrrmachine at 12:26, 25 January 2015

2015-01-25T12:26:31Z

Grrrmachine at 12:10, 25 January 2015

2015-01-25T12:10:11Z

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Grrrmachine at 11:38, 25 January 2015

2015-01-25T11:38:35Z

Grrrmachine at 11:37, 25 January 2015

2015-01-25T11:37:12Z

Grrrmachine at 11:36, 25 January 2015

2015-01-25T11:36:44Z

Grrrmachine at 11:36, 25 January 2015

2015-01-25T11:36:17Z

Grrrmachine at 11:35, 25 January 2015

2015-01-25T11:35:57Z

Grrrmachine: New page: =Parts= E32 735i Servo, Master Cylinder and Reservoir =Tools= 3/8 socket set 11mm brake pipe spanner or combination if you don’t have one Screwdrivers Electric drill and bit...

2015-01-25T10:55:20Z

New page: =Parts= E32 735i Servo, Master Cylinder and Reservoir =Tools= *3/8 socket set *11mm brake pipe spanner or combination if you don’t have one *Screwdrivers *Electric drill and bit...

New page

=Parts=

[[E32]] 735i Servo, Master Cylinder and Reservoir

=Tools=

*3/8 socket set
*11mm brake pipe spanner or combination if you don’t have one
*Screwdrivers
*Electric drill and bits up to 12mm
*Carbide burrs
*Grinder and discs
*Tap and die set (M10x1.5)
*Cutting oil (wd40)
*Rags for keeping stuff clean
*Some washers

=Procedure=

With the E34 calipers on the front, and potentially bigger brakes on the rear as well, the standard E30 master cylinder isn't big enough to move enough fluid. To get around this, most people use the E32 750i MC but I also wanted more assistance to match. The 750i MC is also becoming increasingly expensive due to its rareity, so I'm opting to use a more mundane E32 735i MC and servo instead. This master cylinder is still 25mm, so should improve the feeling to near stock level

However, a few mods will be needed to make this fit.

The E32 I got mine from had a spacer on the back of the servo. There are two options here:

#Use the spacer. This requires the least mods but the brake fluid reservior will be right underneath the inlet boot on the [[M20]] engine, and might not fit.
#Ditch the spacer, but make a few mods instead. This involves:
Grinding down and shortening the push rod to put the clevis at its original level
Open up 2 holes in the bulkhead
Bend the brake lines slightly

I choose number 2 for an original look to the engine bay

Start by opening up the mounting holes
E34Brakes005

Grind down the pushrod
E34Brakes006

Start making the thread using your die
E34Brakes007

Cut about an inch and half cut off (37mm), and thread it as far as you dare
E34Brakes008

Remember if you're doing this yourself then leave the die wound on before you cut the excess off. That way, you can then unwind it and clean the threads so that the clevis can go on with no trouble

test fit
E34Brakes009

I was made up that the standard E32 vacuum line was in the perfect place to line up to the E30 system

The clevis is the trickiest part
I lost the E30 clevis so I used the E32 one but it was way too long. This required trimming and slight mods so please keep your E30 one unless you want some trial and error fitment issues that involves installing and removing the servo/clevis multiple times
E34Brakes010

All done apart from take it all apart to paint the servo and bench bleed the MC
E34Brakes011

@@ Line 76: / Line 76: @@
 The clevis should now thread nicely onto the shortened rod. If all is well you won't need to remove it again, so add a washer and bolt the servo to the bulkhead.
 The clevis can be adjusted to suit the brake mech and can also be adjusted to take any slack out of it
@@ Line 81: / Line 83: @@
 Leave the glovebox out for now until it's all done as you may need to adjust little bits
-Grab your new matching MC
+Grab your new matching MC. Bench bleed it by filling the reservoir of suitable DOT-rated fluid.
-Bench bleed it by filling the reservoir of suitable DOT-rated fluid
+[[Image:E32MasterCylinder001.jpg|400px]]
 Keeping the holes plugged with rags or your fingers, install the MC to the servo and quickly put the brake hard lines in. You will need to bend them to fit as the MC is now further away from the bulkhead, but its not hard or too far to bend them (if you're really picky then make new ones but I'm on a budget).
 Bleed all the brakes, starting from the furthest away from MC, so OSR NSR OSF NSF.
@@ Line 94: / Line 98: @@
 Once all is well and no leaks have appeared then install your glovebox and hopefully you’ll have more braking assistace to match any caliper upgrade you’ve done.

@@ Line 2: / Line 2: @@
 Here's how to install the Master Cylinder and servo from the mighty [[E32]] 7-series.
-[[Image:735i_MC.JPG|right|300px]]
+[[Image:E32MasterCylinder001.jpg|right|300px]]
 =Parts=

@@ Line 2: / Line 2: @@
 Here's how to install the Master Cylinder and servo from the mighty [[E32]] 7-series.
-[[Image:735i_MC.jpg|right|300px]]
+[[Image:735i_MC.JPG|right|300px]]
 =Parts=

@@ Line 2: / Line 2: @@
 Here's how to install the Master Cylinder and servo from the mighty [[E32]] 7-series.
-[[Image:E32MasterCylinder001.jpg|right|300px]]
+[[Image:735i_MC.jpg|right|300px]]
 =Parts=

@@ Line 2: / Line 2: @@
 Here's how to install the Master Cylinder and servo from the mighty [[E32]] 7-series.
-[[Image:28052007259.jpg|right|300px]]
+[[Image:E32MasterCylinder001.jpg|right|300px]]
 =Parts=

@@ Line 1: / Line 1: @@
+Here's how to install the Master Cylinder and servo from the mighty [[E32]] 7-series.
 =Parts=
-[[E32]] 735i Servo, Master Cylinder and Reservoir
+*E32 735i Servo, Master Cylinder and Reservoir
 =Tools=
@@ Line 19: / Line 21: @@
 =Procedure=
-With the E34 calipers on the front, and potentially bigger brakes on the rear as well, the standard E30 master cylinder isn't big enough to move enough fluid. To get around this, most people use the E32 750i MC but I also wanted more assistance to match. The 750i MC is also becoming increasingly expensive due to its rareity, so I'm opting to use a more mundane E32 735i MC and servo instead. This master cylinder is still 25mm, so should improve the feeling to near stock level
+With the [[E34]] calipers on the front, and potentially bigger brakes on the rear as well, the standard E30 master cylinder isn't big enough to move enough fluid. To get around this, most people use the E32 750i MC but I also wanted more assistance to match. The 750i MC is also becoming increasingly expensive due to its rareity, so I'm opting to use a more mundane E32 735i MC and servo instead. This master cylinder is still 25mm, so should improve the feeling to near stock level
 However, a few mods will be needed to make this fit.

Fitting E32 Master Cylinder - Revision history

Grrrmachine at 12:26, 25 January 2015

Grrrmachine at 12:10, 25 January 2015

Grrrmachine at 11:38, 25 January 2015

Grrrmachine at 11:37, 25 January 2015

Grrrmachine at 11:36, 25 January 2015

Grrrmachine at 11:36, 25 January 2015

Grrrmachine at 11:35, 25 January 2015

Grrrmachine: New page: =Parts= E32 735i Servo, Master Cylinder and Reservoir =Tools= *3/8 socket set *11mm brake pipe spanner or combination if you don’t have one *Screwdrivers *Electric drill and bit...

Grrrmachine: New page: =Parts= E32 735i Servo, Master Cylinder and Reservoir =Tools= 3/8 socket set 11mm brake pipe spanner or combination if you don’t have one Screwdrivers Electric drill and bit...