Jump to content
Model Cars Magazine Forum

Scratch Building - OMG, Gimmy a Brake


Alyn

Recommended Posts

I'm building the custom version of AMT's excellent 62 Pontiac Catalina kit. While most cars these days have power brakes with the necessary booster, this kit does not. There's only a small, single piston master cylinder which mounts to the firewall. I wanted to dress it up a bit, so I figured adding a booster would help. Here's how I did it:

The main component of the booster is a fat, round disk. Flat styrene could be sandwiched to a suitable thickness and then cut into a round shape however, by starting with tubing, the part will be perfectly round from the start. Tubing the next size down was used to add some working thickness.

Img_5435b.jpg?psid=1

.080" Flat styrene was glued to the squared off end of the tubing. I didn't worry about the shape of the flat material. That will be trimmed once the glue dries. The thicker flat stock was used once again to provide enough material for rounding and shaping.

Img_5463b.jpg?psid=1

Here's the tube after the .080 was cut down and shaped to match the profile of the tubing. The edges were rounded over to rough in the booster shape.

Img_5466b.jpg?psid=1

The end of the tube was then cut off in a miter box to keep it true. I grabbed a scrap of .030" styrene card stock and then using a file and drill, created a flange where the brake master cylinder will mount to the booster.

Img_5551b.jpg?psid=1

To finish it off, the master cylinder was glued into the center hole of the flange. bolts were glued on for some added detail. I also cut a small slice of aluminum tubing to emulate a brake line fitting. Paint is craft store gloss black and Model Masters magnesium. The jury's still out on whether or not the cap will be spiffed up with some Alclad or BMF.

Img_5578b.jpg?psid=1

You can see the Pontiac WIP here:

http://www.modelcarsmag.com/forums/index.php?showtopic=45830&st=0

Edited by Alyn
Link to comment
Share on other sites

I tried some BMF on the master cylinder cap, but couldn't get all the wrinkles out. Then the thought of using aluminum popped up. Don't know why I didn't consider this from the start. I used a piece of 3/16" rod and turned it down to ~ .156" after measuring the existing plastic cap diameter. The top of the cap has a slight bevel leaving the middle of the cap flat. I also bent up some jewelry wire for a brake line. Just have to glue her in place now.

Img_5587b.jpg?psid=1

Link to comment
Share on other sites

  • 2 weeks later...

Join the conversation

You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.

Guest
Reply to this topic...

×   Pasted as rich text.   Paste as plain text instead

  Only 75 emoji are allowed.

×   Your link has been automatically embedded.   Display as a link instead

×   Your previous content has been restored.   Clear editor

×   You cannot paste images directly. Upload or insert images from URL.

×
×
  • Create New...