hard brake pedal

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Dutchbird
Posts: 31
Joined: Mon Oct 31, 2016 4:50 pm

hard brake pedal

Post by Dutchbird » Sun Apr 21, 2019 3:13 pm

Hi,
in my 63' with powerbrake the pedal goes real hard Since yesterday.
I looked into the manual and there they say it could be a vacuüm leak, but the engine runs well. Is it treu That the engine wont run so niCE when vacum leaks?

What could I do more to fix this problem?
Greetings from the Netherlands,

Martin

56' Thunderbird
63' Thunderbird Convertible
65' Thunderbird Convertible

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RedBird64
Posts: 1888
Joined: Wed Oct 31, 2012 11:42 pm
Location: Bothell Wa.

Re: hard brake pedal

Post by RedBird64 » Sun Apr 21, 2019 5:24 pm

The eng could run fine with a vacuum leak (although it's unhealthy) so that's no way to tell. You need to remove boosters vac hose at the eng. Then apply a vacuum to it (I've even just used my mouth before I had a MightyVac) and see if it will hold a vacuum or you just keep sucking and vacuum never builds.

Scott
1964 Coupe Wimbledon white/Rangoon Red w/black int. Owned for 41 years. It was my folks car before that (second owners). VTCI # 12013.

Cliff Rankin
Posts: 164
Joined: Tue Jan 20, 2015 12:24 pm

Re: hard brake pedal

Post by Cliff Rankin » Sun Apr 21, 2019 6:42 pm

Sounds like a vacuum leak or the booster going north. Maybe a little of both. With the car running at idle pull the hose off the booster. You should feel vacuum off that hose. Look around under the hood , see if you see other leaks similar to the one you may have created pulling that hose. (I know , sometimes bad grammar describes it best)
Post what you find. If it’s the booster don’t worry they can be easier and cheaper to fix than you think.
Cliff

Dutchbird
Posts: 31
Joined: Mon Oct 31, 2016 4:50 pm

Re: hard brake pedal

Post by Dutchbird » Wed Apr 24, 2019 3:36 pm

I took off the upper hose. It have a good vacum I think, I do feel it good.
I cant find any leak.
But were does the second hose goes to? Goes to a metal pipe That goes down behind the engine.
image2.jpeg
Greetings from the Netherlands,

Martin

56' Thunderbird
63' Thunderbird Convertible
65' Thunderbird Convertible

tbird
Posts: 2521
Joined: Sat May 10, 2008 11:07 pm
Location: Tyndall MB. Canada

Re: hard brake pedal

Post by tbird » Wed Apr 24, 2019 10:24 pm

The steel pipe going behind the engine is for the transmission Vacuum modulator which controls shift points as the vacuum changes.
Jim Mills
VTCI # 8071
VTCI 1964-66 Technical Editor
2002 Thunderbird
1965 Convertible
1962 Convertible (in progress)
1959 Ford Retractable HT
Many parts cars

Cliff Rankin
Posts: 164
Joined: Tue Jan 20, 2015 12:24 pm

Re: hard brake pedal

Post by Cliff Rankin » Wed Apr 24, 2019 11:21 pm

Have you tried what Scott suggested ? I going to bet if you are sucking air it’s the booster. Pull the master cylinder off and forward , see if the leak is the rubber behind it.
You can pull the booster and fix it yourself or there are shops you can send it to . I don’t know how comfortable you are doing your own repairs.
Cliff

Dutchbird
Posts: 31
Joined: Mon Oct 31, 2016 4:50 pm

Re: hard brake pedal

Post by Dutchbird » Fri Apr 26, 2019 2:53 pm

Ok, think it is a leak in the booster, sucks on the hose and look like I keep getting air.

Can I take the mastercillinder of without disconnecting the oillines?

And is there a way to disconnect the booster so I can keep driving it but without powerbrake?
Greetings from the Netherlands,

Martin

56' Thunderbird
63' Thunderbird Convertible
65' Thunderbird Convertible

Cliff Rankin
Posts: 164
Joined: Tue Jan 20, 2015 12:24 pm

Re: hard brake pedal

Post by Cliff Rankin » Sat Apr 27, 2019 9:36 pm

Well....No , if you bypass it , it would be difficult to drive. Once it’s apart it has to go back before you can drive it. Yes you can normally pull the master cylinder back enough to sneak the booster out. You may need to unplug the wires to the brake switch. Take the brace off above the master cylinder, unbolt the master cylinder and pull forward a little. Parking brake on , comfortable parking spot , door wide open. Take an L shape pick and remove the C clip at the pedal and remove the 4 -3/8 nuts at the firewall . Pull it out and on the bench to see what’s
Going on. How’s that for a start ?
Cliff

Dutchbird
Posts: 31
Joined: Mon Oct 31, 2016 4:50 pm

Re: hard brake pedal

Post by Dutchbird » Fri May 17, 2019 2:14 pm

Ok, update
Changed the booster. Problem solved so far.
Now I see That there is some brakefluid in the booster so I am going to change the mastercillinder as well
Greetings from the Netherlands,

Martin

56' Thunderbird
63' Thunderbird Convertible
65' Thunderbird Convertible

User avatar
RedBird64
Posts: 1888
Joined: Wed Oct 31, 2012 11:42 pm
Location: Bothell Wa.

Re: hard brake pedal

Post by RedBird64 » Fri May 17, 2019 9:28 pm

Brake fluid is death to the booster (probably why yours failed) so you want to wash it out of there fast.

Scott
1964 Coupe Wimbledon white/Rangoon Red w/black int. Owned for 41 years. It was my folks car before that (second owners). VTCI # 12013.

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