Master cylinder replacement - Hot Rod Forum : Hotrodders Bulletin Board
Hotrodders.com -- Hot Rod Forum



Register FAQ Search Today's Posts Unanswered Posts Auto Escrow Insurance Auto Loans
Hot Rod Forum : Hotrodders Bulletin Board > Tech Help> Suspension - Brakes - Steering
User Name
Password
lost password?   |   register now

Reply
 
LinkBack Thread Tools
  #1 (permalink)  
Old 03-16-2009, 01:16 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: NYC
Posts: 29
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Master cylinder replacement

Hi,

The master cylinder on my Austin A40 sometimes empties out the rear reservoir. This only happens when the car is sitting still --- not when I'm driving.

It doesn't seem to be caused by heat, even though the MC is very close to the exhaust (it's under the car), and it doesn't seem to have anything to do with how much driving I've done before it leaks. Sometimes I can go a good distance and there will be no leaking and another time I can drive around the block and find a puddle under the car a half hour later. Always from the rear reservoir.

So I'm replacing the MC.

I took the MC off the '87 Suburban that I used as a donor car for the engine and transmission for my '57 Chevy. This was a power brake setup and I want to know if I can use the MC from the Suburban on the Austin with no booster.

From what I can see of the Austin MC, it looks almost identical to the Suburban MC. Can I use a MC that was in a power brake car with no power brakes and what else do I have to look for to see if the Suburban MC will interchange with the MC that's on the Austin?

I don't know what the MC in the Austin came from originally and if I have to, I'll take it out and try to get a part number off it and get the same one, but I'd like to try to use the MC from the Suburban if I can, since I already have it.

Thanks!

    Advertisement
Reply With Quote Quick reply to this message
Sponsored Links
Advertisement
 
  #2 (permalink)  
Old 03-16-2009, 03:36 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
First, I know squat squared about your Austin A40.

What you should consider w/such a swap is the ratio between the slave cylinder size compared to the master cyl. size. This affects pedal travel and effort.

The 'burb has disc fronts and is (obviously) a large, heavy vehicle. Whether you can get a satisfactory performance from its m/c on your Austin remains to be seen, but start with comparing the bore sizes between the two masters.
Reply With Quote Quick reply to this message
  #3 (permalink)  
Old 03-16-2009, 04:00 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: NYC
Posts: 29
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
The Austin has an MG V8 front suspension with discs and an Olds/Pontiac rear with discs. If that helps.
Reply With Quote Quick reply to this message
  #4 (permalink)  
Old 03-16-2009, 04:24 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Quote:
Originally Posted by Unkie
The Austin has an MG V8 front suspension with discs and an Olds/Pontiac rear with discs. If that helps.
???

Dude, that quit being an Austin a long time ago, by the sounds of it!

But seriously, why don't you rebuild the existing m/cyl?

With the bore diameter being known, even if a "kit" doesn't exist for your exact m/c, you can get the correct size seals for it. If the pistons and bore isn't too far gone, it's a simple matter of hone and replace the seals and dust caps.
Reply With Quote Quick reply to this message
  #5 (permalink)  
Old 03-16-2009, 05:00 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: NYC
Posts: 29
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
That's always a possibility.

I'm not ruling out rebuilding the existing one.

A picture of the car. So we all know what we're dealing with....
Attached Thumbnails
Click image for larger version

Name:	73008 001.jpg
Views:	66
Size:	71.9 KB
ID:	36925  
Reply With Quote Quick reply to this message
  #6 (permalink)  
Old 03-16-2009, 05:40 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
If it goes anything like it looks, you had better have some good brakes!

When you say "Austin" I think, well, Austin. As in one liter, 4 cylinder grocery grabber.

That looks like a race car w/an Austin body- a big difference.

BTW, it's been a while since I've heard of anyone using the old, bullet-proof early Olds/Pont. 3rd. member. Is this an old build, updated or a new build-up? What engine, trans, etc.

Come on, DETAILS!!!
Reply With Quote Quick reply to this message
  #7 (permalink)  
Old 03-16-2009, 06:59 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: NYC
Posts: 29
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
It's a rebuilt old build.

Here's some details taken from my YouTube account, which is here: http://www.youtube.com/user/AlteredAustin

The engine is a 355" Cbevy 4 bolt main block with a steel crank, 12.5:1 compression, unknown cam , old double hump heads with stock size valves with roller rockers, Demon Mighty Demon 650 Carb on a Weiand Single Plane Manifold, Summit HEI Distributor, 8 quart oil pan, S&S chrome headers and Summit glasspack mufflers.

Horsepower is approximately 400.

The transmission is a full manual Hurst shifted Turbo 400 with about a 2000 RPM stall speed converter and a B&M deep pan, Olds/Pontiac with 5.56 gears and a spool or welded gears, I'm not sure which and disc brakes.

The wiring is an American Autowire Highway 15 kit.

Front Tires are Pro Trac front runners and the rear tires are Pro-Trac also, both from Coker Tires.

The car weighs approximately 2000 pounds. The engine is set back where the front seat would normally be, so you drive from the back seat. The car is all steel, including the hoodscoop. The doors, hood and trunklid are skins only. There are no internal structures.

The chassis is the original Austin chassis from the B pillar back and from the B pillar forward is a professionally built 2x3 frame with a slightly extended wheelbase. The rear suspension is the original leaf spring with Air Ride air bags.

The front suspension is an MG V8 rack and pinion.

When the car was raced it was a consistent 10 second flat car.
Reply With Quote Quick reply to this message
  #8 (permalink)  
Old 03-16-2009, 09:47 PM
cobalt327's Avatar
WFO
 
Last wiki edit: Intake manifold
Last journal entry: 1980 Malibu Wagon
Last photo:
Join Date: Mar 2009
Location: Atlanta
Age: 59
Posts: 5,037
Wiki Edits: 1616

Thanks: 128
Thanked 597 Times in 546 Posts
Thanks for the run-down. I can only imagine how much fun that ride would be, especially w/5.56's!!!

Many years ago, my Dad and future bro-in-law (who was the "gofer") built a '40's Ford Anglia w/a 354 Fire Power, A/T and same rear as yours.

It, too, had the engine set way back- it was driven from the back seat!

The "drive shaft" was basically two CV-type u-joints welded together, which was the Achilles heel of the drive train because of the harmonics that were induced.

But while the joints lasted, it was a Beast!
Reply With Quote Quick reply to this message
  #9 (permalink)  
Old 03-16-2009, 09:59 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: NYC
Posts: 29
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Yeah, the driveshaft on the Austin is about 7" long.

It is fun to drive. You can't see traffic lights. I watch the walk/don't walk signs. It rides like a tank - it's really bad (I mean really bad), but I'm working on that.

But besides those things, I love it. I've never had a car that got more attention.

It also sets off car alarms even just idling down the street. Which is also fun. I think it's actually gotten worse. I had it out for the first time this year over the weekend and alarms were going off all over the place. I think the glasspacks are burning out.
Reply With Quote Quick reply to this message
  #10 (permalink)  
Old 03-19-2009, 03:29 PM
Registered User
 
Last photo:
Join Date: Jun 2006
Location: Maui,Hawaii
Posts: 55
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
That's one cool rod!!! That's like Jegs famous first gasser!!!
Reply With Quote Quick reply to this message
  #11 (permalink)  
Old 03-19-2009, 07:07 PM
Registered User
 
Last photo:
Join Date: Aug 2006
Location: NYC
Posts: 29
Wiki Edits: 0

Thanks: 0
Thanked 0 Times in 0 Posts
Thanks....
Reply With Quote Quick reply to this message

Recent Suspension - Brakes - Steering posts with photos

Quick Reply
Message:
Options

Register Now

In order to be able to post messages on the Hot Rod Forum : Hotrodders Bulletin Board forums, you must first register.
Please enter your desired user name (usually not your first and last name), your email address and other required details in the form below.
User Name:
If you do not want to register, fill this field only and the name will be used as user name for your post.
Password
Please enter a password for your user account. Note that passwords are case-sensitive.
Password:
Confirm Password:
Email Address
Please enter a valid email address for yourself.
Email Address:

Log-in

Human Verification

In order to verify that you are a human and not a spam bot, please enter the answer into the following box below based on the instructions contained in the graphic.




Currently Active Users Viewing This Thread: 1 (0 members and 1 guests)
 
Thread Tools

Posting Rules
You may post new threads
You may post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On


Similar Threads
Thread Thread Starter Forum Replies Last Post
master cylinder interchange runn141 Suspension - Brakes - Steering 7 05-03-2009 05:15 AM
Master cylinder without booster? Rons1stRod Suspension - Brakes - Steering 16 11-05-2007 09:06 PM
79 Camaro master cylinder leaking Scottrn Suspension - Brakes - Steering 3 09-20-2007 06:33 AM
HELP ASAP - 77 T/A Master Cylinder and Prop. Valve Question Torx Suspension - Brakes - Steering 1 06-26-2006 01:52 AM
Single to Dual Master Cylinder swazo Suspension - Brakes - Steering 2 10-19-2004 08:00 AM


All times are GMT -6. The time now is 06:11 PM.


Powered by vBulletin® Version 3.8.7
Copyright ©2000 - 2014, vBulletin Solutions, Inc.
Search Engine Optimization by vBSEO 3.6.0 PL2
Copyright Hotrodders.com 1999 - 2012. All Rights Reserved.