Please help , brake pedal to floor
#1
Please help , brake pedal to floor
Evening all. So first off it’s not my car. It’s the missus. So brake pedal went to floor and suspected master cylinder , replaced and the same. Purchased some blanking plugs and the master cylinder is fine , so is the old one. I’m positive there can’t be air in system as I’ve now run 3 ltrs off fluid through bleeding. An abs light was on that I couldn’t clear and has since had wiring changed to rear o/s sensor ( wiring was broke ) so all good but pedal still goes to floor ? All calipers seem fine and there is zero leaks. Please help as this is really bugging me now. Also there it’s no leaks in booster and vacuum is fine.
many thanks. ( there could be a pint in it if we ever meet ) !!!
many thanks. ( there could be a pint in it if we ever meet ) !!!
#2
Scooby Regular
Hi , so what car is it , im assuming not a scooby ? Some abs pumps need to be tech 2 to work , if your fluid is running through , but still a pedal to the floor have you checked for a pool of brake fluid somewhere ? What order are you bleeding the brakes ? 👍
#3
Nissan navara , fluid is coming out fine at each nipple , no leaks bleeding sequence is furthest from resovoir to nearest as manufacturer it’s very weird ! I’m wondering if it’s the actual abs module ( valves ) ? What does the slave cylinder do ?
#4
Scooby Regular
Slave cylinder is the bit in the gearbox that lets you change gear on a manual car , it says disconnect the abs unit electrical supply and disconnect the battery negative supply then bleed it , it's worth a go 👍
#5
Scooby Regular
out of interest have you had the calipers off?? are they upside down now?
bleed nipples should be at the TOP
Modern Brake systems don't really have a 'slave' as such - there is the "Master" which the pedal operates and then the ABS module.......
bleed nipples should be at the TOP
Modern Brake systems don't really have a 'slave' as such - there is the "Master" which the pedal operates and then the ABS module.......
#6
I’ll try without abs module connected and neg disconnect but I can’t see it would make any difference as it’s bled with engine off but I’ll try. Calipers haven’t been off and nipples are at top. Could it be rear wheel cylinders maybe ? As before there is no fluid leak or lines bulging ??
#7
Scooby Regular
Just something some one did on line , I expect battery disconnected will have the same effect , if you do have separate rear calipers for the handbrake that could be throwing up an issue , I take it when you are bleeding it's not got bubbles in the fluid , is the clutch fluid reservoir and brake fluid reservoir sharing a pipe ? Or linked and sucking air in , is it just you bleeding ? I often find the best bleed is two people one pumping one bleeding , is bleeding kit you are using working properly ? 👍
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#8
I’ll try it. Two of us bleed. Son pushes pedal down and holds I lock and unlock nipple according. No small bubbles. The rear are drums I’m wondering if the adjuster or peg thing has come off maybe and allowing cylinder to fully expand without contact to the shoes ? I’m lost really.
#9
Scooby Regular
iTrader: (2)
Has it not snapped yet Must be pre 2015 if it has drums, Is it a D40 or an NP300 ? If you replaced the master cylinder did you bench bleed it first? The ABS pump will need cycled with the diagnostics to purge any air out of the pump and solenoids. You can pump it all day with your foot your wasting your time. How did this all arise.
#10
Has it not snapped yet Must be pre 2015 if it has drums, Is it a D40 or an NP300 ? If you replaced the master cylinder did you bench bleed it first? The ABS pump will need cycled with the diagnostics to purge any air out of the pump and solenoids. You can pump it all day with your foot your wasting your time. How did this all arise.
#13
#15
Scooby Regular
I'm assuming as per my earlier post that the tech 2 would work and sort the issue , fingers crossed that is , I have a tech 2 but no car that needs the abs pump cycle so never tried it , a can't see a standard code reader sorting it 👍
#17
might just take it to garage. No point spending £200 + on a diagnostic tool.
#20
Scooby Regular
iTrader: (2)
sounda a plan ! Just picked up from one garage who re did a wiring issue to rear n/s sensor so abs light is off now finally. He said he thinks it’s still air. Mentioned about the abs and diagnostics he said you can do it by going along the line and cracking nuts on and pump and letting gravity take fluid to that point then doing the two front wheels then topping up and doing rears then back to do front again. ?
might just take it to garage. No point spending £200 + on a diagnostic tool.
might just take it to garage. No point spending £200 + on a diagnostic tool.
#22
thanks chaps. I changed master cylinder because I presumed that was the issue but does it with the same one and old. Both work as I’ve checked with blanks pedal travels an inch and stops dead connect it back up and down it goes. Although there is little braking it pulls quite a bit to left. So maybe air in right hand side ? Thing is I’ve put through 2-3 ltrs of fluid so I’m thinking surely air would be out by now ?
#24
100% not , no fluid leaks on floor and pedal goes solid engine off no nipples open. Just tried again and reversed order and started nearest abs module and also did the load sensing valve , another 1.5 ltrs of fluid no real signs of air only why was between nipple and bottle and still the same.
#26