Triumph Sports Cars

engine swaps and other performance upgrades, plus "factory" V8s (Stag and TR8)

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ALV
Al Vandergoot
Sidney, British Columbia Canada
(67 posts)

Registered:
01/13/2013 09:49PM

Main British Car:
1971 Triumph TR6 Ford 2.3 turbo

Power assist brake servo is toast except for stock is anything a straight drop in?
Posted by: ALV
Date: July 29, 2019 05:54PM

As stated the TR6 brake booster is toast. I can hear swishing sound when pressing the brake pedal plus when i depress the brake pedal before starting there is no slight drop in the pedal once the engine starts. Any aftermaket stuff that is close to a straight drop in or just replace with stock? Thoughts


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5812 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Power assist brake servo is toast except for stock is anything a straight drop in?
Posted by: BlownMGB-V8
Date: July 30, 2019 10:37AM

Making a swooshing sound when you press the pedal just means the sound deadening bit around the pedal rod is gone usually. Also if the pedal doesn't go down more when the engine starts doesn't that mean it retained enough vacuum that the brakes were already applied?

Jim


ALV
Al Vandergoot
Sidney, British Columbia Canada
(67 posts)

Registered:
01/13/2013 09:49PM

Main British Car:
1971 Triumph TR6 Ford 2.3 turbo

Re: Power assist brake servo is toast except for stock is anything a straight drop in?
Posted by: ALV
Date: July 31, 2019 11:07AM

Pretty sure it is the brake booster. Change in the engine rpm and in the vacum gauge when i push the brake pedal along with the hissing whooshing sound when pressing the brake peadal all point to the booster. The check valve on the booster is fine. So i figure the internal booster membrane is hooped. Replacement is a bit pricey but the local british parts guy has a booster in stock. Better safe than sorry.


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5812 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Power assist brake servo is toast except for stock is anything a straight drop in?
Posted by: BlownMGB-V8
Date: July 31, 2019 11:13AM

Just one check. If you turn off the engine and wait a bit, then push the pedal does it still make that whooshing noise? If it does, how many times will it do it before it stops?

OTOH if you like fixing unbroken things, why not?

Jim


ALV
Al Vandergoot
Sidney, British Columbia Canada
(67 posts)

Registered:
01/13/2013 09:49PM

Main British Car:
1971 Triumph TR6 Ford 2.3 turbo

Re: Power assist brake servo is toast except for stock is anything a straight drop in?
Posted by: ALV
Date: July 31, 2019 09:11PM

Whoosing sound never goes away after each compression on the brake after starting shutting down and waiting. Wooshing gets louder and is constant now after starting the car and depressing the brake pedal when i hold it.


dwtr6v8
Don Watson
West Virginia
(268 posts)

Registered:
12/07/2007 07:45AM

Main British Car:
1974 TR6 Ford 5.0 HO

authors avatar
Re: Power assist brake servo is toast except for stock is anything a straight drop in?
Posted by: dwtr6v8
Date: August 01, 2019 08:30AM

Rebuild options:

$175
[www.applehydraulicsonline.com]

$128 ( if you don't mind importing)
[rimmerbros.com]

$126
[www.mssapponline.com]


BlownMGB-V8
Jim Blackwood
9406 Gunpowder Rd., Florence, KY 41042
(5812 posts)

Registered:
10/23/2007 12:59PM

Main British Car:
1971 MGB Blown,Injected,Intercooled Buick 340/AA80E/JagIRS

authors avatar
Re: Power assist brake servo is toast except for stock is anything a straight drop in?
Posted by: BlownMGB-V8
Date: August 01, 2019 10:09AM

So far that sounds pretty good, brakes still work like they should?
The real question is, can you shut 'er down without touching the brakes, go away for a cup of coffee or overnight, and when you step on the brakes it still acts the same? Because if it does the only real complaint you have is the noise, right? That'd mean the vacuum is holding just fine. And if it isn't, the first place to look is the check valve and grommet where the vacuum line comes in, not the servo. The diaphragms rarely go bad, it's really amazing how long they last without deteriorating.

Now about that whooshing noise: When the pedal is pressed the rod opens a valve that releases vacuum past a sound dampener/filter donut around the rod and into the cabin of the car. The air that rushes into the back side of the booster then pushes the diaphragm towards the master cylinder. So if you are hearing that whooshing noise, all that means is that the booster is working correctly but that the filter/dampener has deteriorated. Which they do. It's nothing but a foam donut, and not hard to replace. But it'll work fine without it.

Jim



ALV
Al Vandergoot
Sidney, British Columbia Canada
(67 posts)

Registered:
01/13/2013 09:49PM

Main British Car:
1971 Triumph TR6 Ford 2.3 turbo

Re: Power assist brake servo is toast except for stock is anything a straight drop in?
Posted by: ALV
Date: August 07, 2019 03:51PM

Actually the braking was poor. as well. I pulled the old booster and there is all kinds of corrosion inside where the master cylinder attaches. The one way check valve is working fine. I took out the master side pushrod seal/rubber grommet and inside the booster there is a shiny black brown fluid inside when i shine the flashlight inside. Hmm looks a bit concerning. Is it okay for some moisture inside? Thanks for all the info.


88v8
Ivor Duarte
Gloucestershire UK
(671 posts)

Registered:
02/11/2010 04:29AM

Main British Car:
1974 Land Rover Lightweight V8

Re: Power assist brake servo is toast except for stock is anything a straight drop in?
Posted by: 88v8
Date: August 09, 2019 04:54AM

Brown fluid... at some point the master has been leaking into the servo. Given that brake fluid is hygroscopic, that encourages internal corrosion.

For the cost, you may as well replace it.

Then if the braking is still poor, at least you will have eliminated the servo.

Ivor


ALV
Al Vandergoot
Sidney, British Columbia Canada
(67 posts)

Registered:
01/13/2013 09:49PM

Main British Car:
1971 Triumph TR6 Ford 2.3 turbo

Re: Power assist brake servo is toast except for stock is anything a straight drop in?
Posted by: ALV
Date: August 11, 2019 12:31AM

Yup went ahead and replaced the booster with stock braking is fine and solid now.


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