MKIV brake mastercylinder access

[cobradoc]

Is there a trick to replace the brake mastercylinder on a MKIV?  The top of the trap door in the wheel well in front of the mastercylinder is riveted in with 15-20 rivets that would need to be drilled out.  The bottom of that trap door is held in with screw clamps that can be loosened and removed but access  is to low to get to the booster and mastercylinder

[westcott]

You need to remove the side vent, it is screwed on top and bottom (1 nut and bolt up and down) to an angled metal bracket welded to the fender inner surface.
Then you have access to the master cylinder, together with the removed access door in the wheel well it should be possible to remove the master cylinder.

It sounds like your car has no removable access door in the front wheel well.
In this case you need to loosen the wheel well by the screw clamps and bend it carefully away from the frame if access through the side vent is not enough for you, it is flexible.

[cobradoc]

Thanks for the info -using the vent and the bottom section of the trap door that is removable should give me enough access.