Brake/vacuum issues
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Laughing Gas
Joined: Aug 2005
Posts: 831
Likes: 0
From: Port Elgin, On
Brake/vacuum issues
Hey all,
I'm posting on behalf of my dad, he has a 1997 F350 CC, LB, 2WD dually. Truck has about 150,000 on it and its completely stock.
His brakes work fine while driving but when at idle he slowly loses braking ability and then the pedal goes hard.
He has a new pump and master cylinder and has done vacuum checks on the system and everything holds. He is now being told that this is a common issue with this era of truck
and he needs a brake booster assembly. Is there any truth to this? Is there another way to fix this?
Thank you for any help.
I'm posting on behalf of my dad, he has a 1997 F350 CC, LB, 2WD dually. Truck has about 150,000 on it and its completely stock.
His brakes work fine while driving but when at idle he slowly loses braking ability and then the pedal goes hard.
He has a new pump and master cylinder and has done vacuum checks on the system and everything holds. He is now being told that this is a common issue with this era of truck
and he needs a brake booster assembly. Is there any truth to this? Is there another way to fix this?
Thank you for any help.
Lead Driver
Joined: Sep 2002
Posts: 9,500
Likes: 2,021
From: North Texas
Booster popped in my head half way through reading your issues. I have dealt with leaking boosters on other vehicles that are Diesel powered, similar problems.
Maybe let truck sit overnight. Pull vac line off booster and see if any vacuum is left. If not, booster time.
You should slap a downpipe on it, better intake boots, verify you have the updated screws for the stock air intake, and the cruise switch update!
Maybe let truck sit overnight. Pull vac line off booster and see if any vacuum is left. If not, booster time.
You should slap a downpipe on it, better intake boots, verify you have the updated screws for the stock air intake, and the cruise switch update!
Thread Starter
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Laughing Gas
Joined: Aug 2005
Posts: 831
Likes: 0
From: Port Elgin, On
Thanks Hit Man,
So the truck already has a brake booster from factory? The way he is being told is the truck doesn't have one but adding one will fix the problem.
Thank you for the stock upgrade tips.
So the truck already has a brake booster from factory? The way he is being told is the truck doesn't have one but adding one will fix the problem.
Thank you for the stock upgrade tips.
Lead Driver
Joined: Mar 2006
Posts: 5,098
Likes: 1,504
From: western SD
The truck has a brake booster from the factory. Ford came out with a "zero loss brake booster" I think it is called, or something like that. There have been a few people report a fix with the new Ford part.
Lead Driver
Joined: Sep 2002
Posts: 9,500
Likes: 2,021
From: North Texas
F5TZ-2005-CA
I think that is the PN. I found it on this -
1997 and earlier diesel trucks equipped with vacuum power brakes -low/creeping pedal.
Many owners have complained of a low or creeping brake pedal on their trucks, often mistaken for a bad master cylinder or rear ABS valve. If the condition occurs after the vehicle has come to a stop, and no other brake concerns are found,(worn or out-of-adjustment brakes, cocked pads, or hydraulic problems) the condition is normal and is the result of the vacuum pump replenishing the vacuum inside the power brake booster. Ford has developed a Zero-Loss Travel brake booster to correct this condition if the customer finds it unacceptable. This part is only for use on diesel equipped trucks--P/N F5TZ-2005-CA--and is not a service replacement, it must be ordered by the part number, not vehicle application.
I think that is the PN. I found it on this -
1997 and earlier diesel trucks equipped with vacuum power brakes -low/creeping pedal.
Many owners have complained of a low or creeping brake pedal on their trucks, often mistaken for a bad master cylinder or rear ABS valve. If the condition occurs after the vehicle has come to a stop, and no other brake concerns are found,(worn or out-of-adjustment brakes, cocked pads, or hydraulic problems) the condition is normal and is the result of the vacuum pump replenishing the vacuum inside the power brake booster. Ford has developed a Zero-Loss Travel brake booster to correct this condition if the customer finds it unacceptable. This part is only for use on diesel equipped trucks--P/N F5TZ-2005-CA--and is not a service replacement, it must be ordered by the part number, not vehicle application.
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