abs pre load pump

neilhdi · Post by **neilhdi** » Sat Dec 14, 2013 4:36 pm

can anyone shine any light on what the abs preload pump does on my car please im having some trouble with the brakes ive got a pedal that take 3 pumps to make it work as it should,the problem came from no where as i left a motorway junction needless to say the big stone brakes at the side off the road helped me stop!! oh yes it a 53 plate 110hdi exec estate with esp ive blead brake no change was going to change my master cylinder for a secondhand one but its a 3 port unit so rare as hens teeth secondhand then i notticed the strange part that turns out to be the pre load pump, does anyone know what it does???

lozz · Post by **lozz** » Sat Dec 14, 2013 4:54 pm

Hi @welcome to the forum,

Have you checked the Vacume pipe to Master cylinder?.

neilhdi · Post by **neilhdi** » Sat Dec 14, 2013 5:01 pm

yes checked everything servo work perfect no vacume leaks and will brake as before once ive pump pedal 3 times!!!!!!!!!

lozz · Post by **lozz** » Sat Dec 14, 2013 5:27 pm

has it got one of these fitted?

http://www.ebay.co.uk/itm/PEUGEOT-406-1 ... 45f971ebe5

ibelieve some do some don't,.

but if it does maybe its worth seeing if its sticky?

lozz · Post by **lozz** » Sat Dec 14, 2013 5:36 pm

link from another forum - http://www.peugeotcentral.co.uk/ftopic-4810.html

see post on there from Mr canyon dust,

neilhdi · Post by **neilhdi** » Sat Dec 14, 2013 9:05 pm

lozz wrote:has it got one of these fitted?

http://www.ebay.co.uk/itm/PEUGEOT-406-1 ... 45f971ebe5

ibelieve some do some don't,.

but if it does maybe its worth seeing if its sticky?

no its not got a load valve i can categorically say its not the rear brakes as i have fitted a whole new rear axle assembly compleat with calipers, and new front discs and pads at witch point ive inspected sliders ect
i have the same problem still and im getting poorer

neilhdi · Post by **neilhdi** » Sat Dec 14, 2013 9:08 pm

does any one know what the pre load pump does and if it failure causes this problem?

markw · Post by **markw** » Mon Dec 16, 2013 10:34 am

Does your car have the ESP option? (Electronic Stability Program)
I thought the pump is for that system, in as much as if your car gets into a skid, the ESP system will operate the brakes on one or more corners of the car to attempt to correct your trajectory!
This pump is what pressures up the hydraulics to make things happen......

406oc.co.uk

abs pre load pump

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