Re: [T3] 73 Front Brakes on a '70

["Dave Hall" <dave@hallvw.clara.co.uk>]

Type 36 with 4 piston calipers
Bleeding the brakes
The system can be bled either by pumping the pedal or by using a
pressure bleeding appliance.  The correct sequence is as follows:

1 - Right rear wheel cylinder.
2- Left rear wheel cylinder.
3- Right caliper, outside (bleeder screws 1 and 2).
4- Right caliper, inside (bleeder screw 3).
5- Left caliper, outside (bleeder screws 1 and 2).
6- Left caliper, inside (bleeder screw 3).

ASCII rendition of bleed nipple layout (picture shows left-hand
caliper), looking at pad spreader spring:-

  1
4 2         3  5
                   6

(6 is the lowest one and 1 sticks upwards;  not sure if the
right-hand caliper is identical, but it must be obvious or they
would show both as they do for the K70).

Note
The screws 4, 5 and 6 are only for brake fluid changing and must not
be opened when bleeding the brakes.

Changing brake fluid

1 - Pump fluid out through bleeder screws in rear wheel cylinders.
2 - Open screws 4, 5 and 6 on both front wheels and pump out more
fluid,
3- Open screws 1, 2 and 3 and leave them open until fluid no longer
drips from screws 4, 5 and 6.
Put new fluid in and bleed system as explained above.


Source:  VW Factory Workshop Manual, 1969 edition (Supplement 8/72)
Brakes, Wheels, Tires, Hand and Foot Controls.  (VW 'God' to us!)

Dave.
UK VW Type 3&4 Club
www.hallvw.clara.net/
-----Original Message-----
From: Sandin, Karl-Olov <Karl-Olov.Sandin@MoDoSkog.MoDoGroup.com>
To: 'jadney@vwtype3.org' <jadney@vwtype3.org>
Cc: 'type3@vwtype3.org' <type3@vwtype3.org>
Date: 02 December 1998 12:48
Subject: Re: [T3] 73 Front Brakes on a '70


>Jim Adney wrote:
>>>
>>Cool is right!  I never thought I'd ever get to hear about one of
>>those.  Do you know the diameter of the pistons?  I doubt the
braking
>>power is any different, just the safety thing.
>>>
>
>Hello Jim!
>I have measured the pistons for you, and the diameter is 30 mm. The
calipers
>have 6 (six!) bleeder valves...only God knows in which order I
should bleed
>this system... Don't really need to - just want to change the
fluid. Any
>hints?
>
>You are probably right about the safety thing. It seems to be a
full
>triangular split system just as on the Volvo. The MC is special on
this
>model.
>See excellent scheme from Dave Hall, publiced by Greg, on this
page:
>http://vwtype3.org/scrapbook/4pot/
>
>
>-Too-de-loo-o ...   :-)
>
>/Karl-Olov Sandin
>-73 Squareback
>(- I always knew she was someting special...)
>
>-------------------------------------------------------------------
>List info at http://www.vwtype3.org/list or mailto:help@vwtype3.org
>