Transitmania 12 @Santa Pod 15th to 17th May 2020


Brake Pedal Loss

Transit Mk1 & 2 Forum. All Transits 1965 - 1986

Moderator: Luke

Brake Pedal Loss

Postby Mk1-nightmare » Wed Sep 16, 2020 4:53 pm

Hello gents
I wonder if you could help me
I have a camper van twin wheel with brake pedal on the floor and remote servo
I’m trying to get it roadworthy after being stood idle for a few years
I’m not a trained mechanic but do have some knowledge to help me along
I’m currently having issues where the brake system won’t hold pressure
I can pump the pedal and obtain a firm pedal with brakes applied but when I release the pedal, after 10 seconds the pressure is lost And the pedal goes to the floor
I have replaced all flex hoses and ensured there are no leaks on the brake cylinders etc But I can’t see how or where I’m losing system pressure. I have replaced all seals on the cylinders
I have purged the system of old fluid and bled the brakes correctly

I’m stuck and don’t know how to resolve this, other than assume the servo is faulty and replace it

Does anyone have any ideas

Thanks
Mk1-nightmare
Newbie
 
Posts: 9
Joined: Fri Sep 04, 2020 10:04 pm

Re: Brake Pedal Loss

Postby Neil » Wed Sep 16, 2020 7:05 pm

have you changed all the flexis ?
Neil v6
Neil
Transit Extremist
Transit Extremist
 
Posts: 5680
Joined: Sun May 01, 2005 5:09 pm
Location: Preston

Re: Brake Pedal Loss

Postby Chug » Wed Sep 16, 2020 8:01 pm

If it pumps up and pedal goes hard then it probably just needs shoes adjusting, or you've got air in the system somewhere...master cylinder seals?
1991(J) twin wheel tipper 2.5di
1994(L) twin wheel tipper 2.5di
Chug
Transit Devotee
Transit Devotee
 
Posts: 1261
Joined: Tue Jan 02, 2018 9:27 pm
Location: Tring, Hertfordshire

Re: Brake Pedal Loss

Postby Stumble » Wed Sep 16, 2020 8:36 pm

Chuggy wrote:If it pumps up and pedal goes hard then it probably just needs shoes adjusting


Seconded :mrgreen:
Stumble
Transit Aficionado
Transit Aficionado
 
Posts: 203
Joined: Wed Feb 19, 2020 7:17 pm
Location: SW UK

Re: Brake Pedal Loss

Postby Mk1-nightmare » Thu Sep 17, 2020 6:59 pm

Neil wrote:have you changed all the flexis ?


Yes all flexi hoses replaced
Mk1-nightmare
Newbie
 
Posts: 9
Joined: Fri Sep 04, 2020 10:04 pm

Re: Brake Pedal Loss

Postby Mk1-nightmare » Thu Sep 17, 2020 7:02 pm

Chuggy wrote:If it pumps up and pedal goes hard then it probably just needs shoes adjusting, or you've got air in the system somewhere...master cylinder seals?


Master cylinder seals replaced
Pedal pumps hard and if you hold pedal it stays hard
When you release pedal and wait 10-20 seconds, it loses its pressure and goes to the floor
You need to pump it again to get the pedal hard
Pretty sure it’s not air. Have bled each corner in order, multiple times
Mk1-nightmare
Newbie
 
Posts: 9
Joined: Fri Sep 04, 2020 10:04 pm

Re: Brake Pedal Loss

Postby Mk1-nightmare » Thu Sep 17, 2020 7:11 pm

Removed the servo today
Have found that the vacuum inlet washer/seal has perished and separated
Does this maintain the vacuum and if failed could be the source of the problem. See picture

Also the pipe from cylinder block to rear of servo, the rubber elbow connection has also perished and split.
Explains why it was taped up by the previous owner
I broke the connection to the servo when trying to inspect condition

Does anyone know where I can obtain spare seals etc

Thanks


41901AC5-C8DA-4FD1-9B09-241DB431292D.jpeg
You do not have the required permissions to view the files attached to this post.
Mk1-nightmare
Newbie
 
Posts: 9
Joined: Fri Sep 04, 2020 10:04 pm

Re: Brake Pedal Loss

Postby Ralph.9 » Fri Sep 18, 2020 6:54 am

I might have what you need, I will have a look.
Ralph.9
Transit Aficionado
Transit Aficionado
 
Posts: 448
Joined: Sun Aug 28, 2011 9:53 pm
Location: Holland on sea Essex

Re: Brake Pedal Loss

Postby Neil » Fri Sep 18, 2020 7:15 am

get the servo reconditioned
Neil v6
Neil
Transit Extremist
Transit Extremist
 
Posts: 5680
Joined: Sun May 01, 2005 5:09 pm
Location: Preston

Re: Brake Pedal Loss

Postby conrod » Fri Sep 18, 2020 11:53 am

servo is not the source of your problem, although should be repaired anyway. Sounds like you have air still trapped in the system. Do your front brake calipers have multiple bleed screws? (the 4 pot calipers can have 3 bleed screws per side) Did you bleed from all of them? Borrow a vacuum bleeder and try it with that. They connect to an air compressor, and basically suck the fluid through the system. Great for problematic systems.
User avatar
conrod
Transit Devotee
Transit Devotee
 
Posts: 804
Joined: Mon Apr 23, 2007 1:43 pm
Location: new zealand

Re: Brake Pedal Loss

Postby Mk1-nightmare » Sat Sep 19, 2020 9:35 am

Neil wrote:get the servo reconditioned


Hello Neil. I have sent it away to be reconditioned
Mk1-nightmare
Newbie
 
Posts: 9
Joined: Fri Sep 04, 2020 10:04 pm

Re: Brake Pedal Loss

Postby Mk1-nightmare » Sat Sep 19, 2020 9:38 am

conrod wrote:Do your front brake calipers have multiple bleed screws? (the 4 pot calipers can have 3 bleed screws per side) Did you bleed from all of them? Borrow a vacuum bleeder and try it with that.


Hello Conrod. I don’t have callipers I have drums on the front. I will take your advice though about using a vacuum bleeder.
Mk1-nightmare
Newbie
 
Posts: 9
Joined: Fri Sep 04, 2020 10:04 pm

Re: Brake Pedal Loss

Postby Neil » Sat Sep 19, 2020 12:29 pm

Mk1-nightmare wrote:
Neil wrote:get the servo reconditioned


Hello Neil. I have sent it away to be reconditioned

IF ITS BEEN ON FROM NEW ITS TIME
Neil v6
Neil
Transit Extremist
Transit Extremist
 
Posts: 5680
Joined: Sun May 01, 2005 5:09 pm
Location: Preston


Return to Mk 1 & 2



Who is online

Users browsing this forum: No registered users

croncroncron