Classic Mustangs List Archive
Diagnosing my power-assist brake/vacuum problem
 ., Online, USA
 |
|
., Online, USA
|
This read-only message was archived from a public mail list.
Mail From: Columbo Ron-P19467 (email redacted)
Booster, booster, booster. Same symptoms with my truck last year.
Ron Columbo
Chandler, AZ
64-1/2 Conv
65 GT FB
65 FB
70 Mach I
85 CK-10
-----Original Message-----
From: Chris Tann [mailto
email redacted)]
Sent: Thursday, June 15, 2000 7:39 PM
Hi all,
I've got a problem with the brakes on my 68 GT500KR. I'm pretty sure its a
vacuum
problem of some sort - when I brake, I can hear a hissing coming from under
the hood,
and there is very little effect. When I push _really_ hard, the brakes work,
although
not as well as they should.
So, I figure its the brake booster (oh yes, power brakes). However, I tried
disconnecting the
manifold vacuum line, and the engine dies. Is that normal? Also, under hard
braking, the
engine revs drop down lower than normal. The Manifold vaccum is about 18" at
idle,
which seems to me to be OK. Acceleration response looks normal (this is
parked),
with the vacuum dropping down quickly, then coming back up, and popping
higher than
idle when I ease off again. When I brake at idle, the manifold vacuum drops
down to
about 11"
So, is it just my brake booster? Any way I can double check that thats where
the problem is?
I read that they need to be replaced, as they cannot be serviced - is that
true?
Wow, what a load of questions! Thanks for any help you can give.
Regards,
Chris.
Mail From: Columbo Ron-P19467 (email redacted)
Booster, booster, booster. Same symptoms with my truck last year.
Ron Columbo
Chandler, AZ
64-1/2 Conv
65 GT FB
65 FB
70 Mach I
85 CK-10
-----Original Message-----
From: Chris Tann [mailto
email redacted)]Sent: Thursday, June 15, 2000 7:39 PM
Hi all,
I've got a problem with the brakes on my 68 GT500KR. I'm pretty sure its a
vacuum
problem of some sort - when I brake, I can hear a hissing coming from under
the hood,
and there is very little effect. When I push _really_ hard, the brakes work,
although
not as well as they should.
So, I figure its the brake booster (oh yes, power brakes). However, I tried
disconnecting the
manifold vacuum line, and the engine dies. Is that normal? Also, under hard
braking, the
engine revs drop down lower than normal. The Manifold vaccum is about 18" at
idle,
which seems to me to be OK. Acceleration response looks normal (this is
parked),
with the vacuum dropping down quickly, then coming back up, and popping
higher than
idle when I ease off again. When I brake at idle, the manifold vacuum drops
down to
about 11"
So, is it just my brake booster? Any way I can double check that thats where
the problem is?
I read that they need to be replaced, as they cannot be serviced - is that
true?
Wow, what a load of questions! Thanks for any help you can give.
Regards,
Chris.
|
., Online, USA
|
This read-only message was archived from a public mail list.
Mail From: Columbo Ron-P19467 (email redacted)
Booster, booster, booster. Same symptoms with my truck last year.
Ron Columbo
Chandler, AZ
64-1/2 Conv
65 GT FB
65 FB
70 Mach I
85 CK-10
-----Original Message-----
From: Chris Tann [mailtoemail redacted)]
Sent: Thursday, June 15, 2000 7:39 PM
Hi all,
I've got a problem with the brakes on my 68 GT500KR. I'm pretty sure its a
vacuum
problem of some sort - when I brake, I can hear a hissing coming from under
the hood,
and there is very little effect. When I push _really_ hard, the brakes work,
although
not as well as they should.
So, I figure its the brake booster (oh yes, power brakes). However, I tried
disconnecting the
manifold vacuum line, and the engine dies. Is that normal? Also, under hard
braking, the
engine revs drop down lower than normal. The Manifold vaccum is about 18" at
idle,
which seems to me to be OK. Acceleration response looks normal (this is
parked),
with the vacuum dropping down quickly, then coming back up, and popping
higher than
idle when I ease off again. When I brake at idle, the manifold vacuum drops
down to
about 11"
So, is it just my brake booster? Any way I can double check that thats where
the problem is?
I read that they need to be replaced, as they cannot be serviced - is that
true?
Wow, what a load of questions! Thanks for any help you can give.
Regards,
Chris.
_______________________________________________
Classic-mustangs mailing list
(email redacted)
mix.twistedpair.ca/mailman/listinfo/classic-mustangs
Mail From: Columbo Ron-P19467 (email redacted)
Booster, booster, booster. Same symptoms with my truck last year.
Ron Columbo
Chandler, AZ
64-1/2 Conv
65 GT FB
65 FB
70 Mach I
85 CK-10
-----Original Message-----
From: Chris Tann [mailto
email redacted)]Sent: Thursday, June 15, 2000 7:39 PM
Hi all,
I've got a problem with the brakes on my 68 GT500KR. I'm pretty sure its a
vacuum
problem of some sort - when I brake, I can hear a hissing coming from under
the hood,
and there is very little effect. When I push _really_ hard, the brakes work,
although
not as well as they should.
So, I figure its the brake booster (oh yes, power brakes). However, I tried
disconnecting the
manifold vacuum line, and the engine dies. Is that normal? Also, under hard
braking, the
engine revs drop down lower than normal. The Manifold vaccum is about 18" at
idle,
which seems to me to be OK. Acceleration response looks normal (this is
parked),
with the vacuum dropping down quickly, then coming back up, and popping
higher than
idle when I ease off again. When I brake at idle, the manifold vacuum drops
down to
about 11"
So, is it just my brake booster? Any way I can double check that thats where
the problem is?
I read that they need to be replaced, as they cannot be serviced - is that
true?
Wow, what a load of questions! Thanks for any help you can give.
Regards,
Chris.
_______________________________________________
Classic-mustangs mailing list
(email redacted)
mix.twistedpair.ca/mailman/listinfo/classic-mustangs
Sorry, you can't reply to this topic. It has been closed.
Having trouble posting or changing forum settings?
Read the Forum Help (FAQ) or click Contact Support at the bottom of the page.
