Servo Issues
#1
Posted 13 November 2020 - 06:36 PM
I don't usually post on here for technical issue as I pretty much search and do my own work but the below has stumped me.
I was driving to get my car mot and the brake pedal hits the floor!
The brakes have been bled fully 4 times, new front pistons and seals. No visible leaks and once I block the vacuum end the brakes work fine..
Could this need a servo repair kit?
#2
Posted 13 November 2020 - 06:57 PM
I have had this previously on 2 minis, replacing the master cylinder solved the issue both times
#3
Posted 13 November 2020 - 07:14 PM
Sounds like you need to replace the master cylinder. Loss of servo would just give a firmer pedal but shouldn't give a longer pedal like you are experiencing.
I have had this previously on 2 minis, replacing the master cylinder solved the issue both times
Brakes work fine with servo bypassed which would still use the master cylinder?
#4
Posted 14 November 2020 - 09:06 AM
If I connect the servo up with the engine running the pedal goes to the floor and I have no brakes.
#5
Posted 14 November 2020 - 10:47 PM
You could try a known working servo to rule it out but personally I think the issue is elsewhere, but without being with the car it's a longer process of elimination
Edited by cal844, 14 November 2020 - 10:48 PM.
#6
Posted 14 November 2020 - 11:00 PM
Remove the outgoing pipes from the master cylinder, let the fluid run out of the ports whilst you blank off these outlets. This now leaves only the servo and the master cylinder in circuit. Now check again and see what symptoms you have.
#7
Posted 15 November 2020 - 09:09 AM
I have definitely bleed the system correctly.
#8
Posted 15 November 2020 - 09:27 AM
Have you adjusted the drums properly? There is a good guide in this video
#9
Posted 15 November 2020 - 09:43 AM
Brakes work fine without servo connected.
I'm absolutely certain all the brakes are bled correctly as this is a basic thing that I would always check every few months anyway. I had instant brake failure not a gradual problem
#10
Posted 15 November 2020 - 10:15 AM
#11
Posted 15 November 2020 - 10:17 AM
Checked-
For leaks
Adjusted drums
Handbrake adjusted correctly
Re bleed brakes
Checked servo pins and brakes pedal
Brake fluid topped up
No air leaks from servo
Brakes work with servo disconnected
Edited by petey81, 15 November 2020 - 10:21 AM.
#12
Posted 15 November 2020 - 10:35 AM
#13
Posted 15 November 2020 - 10:40 AM
I'm not loosing any fluid so very odd.
I have fiesta calipers upfront with green stuff pads so no issues without the servo connected.
#14
Posted 15 November 2020 - 01:35 PM
#15
Posted 15 November 2020 - 02:58 PM
As I said previously I had the same issue and replacing the master cylinder cured this. As there are no leaks anywhere is change the cylinder
Did you change the whole thing or rebuild kit?
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