9 replies to this topic

[Mikka]

Hello,

 

Can anybody help me.

I have Mondeo Mk1, 2.0 Ghia.

I replaced front discs and brake pads, rear brake shoes and brake cylinders.

I bleed the brakes, put new brake oil. Everything works good but brake warning lamp dont tun off.

Any sugestions? Please help.

Picture of warning lamp in attachment.

[Master-of-none]

The workshop manual says

"Brake Pad Wear:
This warning illuminates when one or more of the (disc) brake pads wears low. Drum brakes are not included.
The sensors are small wire loops embedded in the the inner pads of each pair of disc brake pads. When a pad wears down, the wire loop is severed and the appropriate warning is generated."

 

Do your new pads have the wear sensors connected correctly? 

Are the wires and connectors in good condition?

 

I found this diagram, it shows the pad sensors are connected in pairs to earth, any wire not connected will cause the warning.

[Mikka]

Yes, eveything is conneced correctly. Everything is new and genuine by Motorcaft.

[PURPLE_2L_LX]

You need to compare the resistance across the pads, are they equal and what

figure are you getting?

 

Then check the Wires for an earth connection One dodgy connection or broken

wire will trigger the light. As mentioned above it's a single wire in a loop across

both front pads.

[ST56]

Hi

 

Does your car have a level sensor in top of master cylinder and is the the light it uses. If yes make sure connection is fully engaged, they can be dislodged when cap off to add fluid.

 

Peter

[Mikka]

I double checked all wires and all connections and all are good. Car have level sensor in top of brake fluid canister.

 

Later i detected leaking in one of the brake pipes (leitungs) on rear axle, can it be the reason for this warning lamp or that two problems are not connected?

[PURPLE_2L_LX]

Fluid level dropped too low?

 

Can you operate the plunger in the cap?  Does that put the light out?

 

If no plunger unplug the connector and see if that works, if not bridge the

connectors with a piece of wire and see if the light goes out.

[ST56]

Hi

 

Do you still have the old brake pads if cable is complete on one, you can plug into chassis connector on each side to check if one of the new pad circuits is faulty. Assuming warning light has only come on after work something has been disturbed, it may take a take a check for electrical continuity to find problem.

 

Another item to check does warning light illuminate if hand brake is partially on, is rear break adjusted correctly allowing lever to drop fully to floor.

 

Leak in pipe will only cause problem if system dropped level but obviously needs fixing as soon as.

 

Peter

[Mikka]

No, fluid level did not dropped too low, it is between min and max.

Plunger is not in the cap, it is on container. I disconected wire and connected again and nothing.

I tried also disconect new pads and short connect with piece of wire and still nothing.

Very annoying. Dont know what to do next.

[Mikka]

Problem is still there. I checked pads and they are ok.

Does anyone have some idea what to do?

Does it involve any relay maybe?