Spongy Brake Pedal

[alijawad]

Hi Folks.

i am confused about one thing when my car engine is not running the brake pedal is fine when the engine is ON the brake pedal is songy. what could be possible reason for that...all brake pad are changed on it today.
any reply is appreciated.

thanks

 

[hyphon12]

It's normal for the pedal to drop with the engine running (if that's your worry). That's the servo doing its job. Just give it a run and bed in the brakes, if it doesn't improve then a brake fluid bleed wouldn't be a bad idea.

 

[alijawad]

what will be the brake sequence? secondly shall i do one man simple bleeing or shall i use the bleeding equipment?

 

[brad_barker12]

Don't bleed the brakes using the pump the pedal method. Use a pressure bleeder kit.

Bleeding via the pedal can damage the master cylinder. Where your pushing the brake pedal further down its travel than usual flips the seal in the master cylinder. You will lose the crispy ness of the pedal it will feel generally spongy.

 

[hyphon12]

I'd use bleeding equipment. Bleeding via the pedal on these Leons risks damaging the seals inside the master cylinder and servo. Bleeding order is Rear Right, Rear Left, Front Right, Front Left.

 

[alijawad]

guys thanks for the help just one more question as mentioned in last reply regarding the bleeding sequence....is it gonna be same if i use bleeding kit. bear in mind its 1.6 51 plate.
thanks for all the help appreciate that.

 

[hyphon12]

yup, that's the sequence quoted by VAG, which they also specify to use a pressure bleeder.

 

[Adam4D]

Bleeding order is actually, left front, right front, left rear, right rear, as quoted from elsa.

On road test make sure you get abs to activate at least once.

This is as per elsa workshop manual

 

[hyphon12]

Oops yeah you're right. Misread it, my bad. Haha.

 

[alijawad]

Bleeding order is actually, left front, right front, left rear, right rear, as quoted from elsa.

On road test make sure you get abs to activate at least once.

This is as per elsa workshop manual

cheers all, you helped me alot...thanks again....

 

[alijawad]

hello all,
just to let you know i have ordered Pressure Bleeding Kit Gunson one from Amazon and will order a liter of Dot4 too and let the experiment began upon arrival......

 

[bruceR]

Bleeding order is actually, left front, right front, left rear, right rear, as quoted from elsa.

On road test make sure you get abs to activate at least once.

This is as per elsa workshop manual

Hi Adam, which is the front right? - is it drivers or passengers side?

 

[hyphon12]

^driver's side

 

[Adam4D]

If you still have issues after pressure bleeding then follow this.

Pressure system with bleeder.
Open brake nipple to let fluid bleed
Whilst bleeding, Slowly hand pump the brake pedal to the floor 3 times
Allow fluid to bleed then lock nipple.

Carry out on all 4 calipers in correct order I stated earlier.

This is assuming the system hasn't be changed aka master cylinder changed.
if that has been changed and has a bleed nipple on it then pressure bleed from there first and pump pedal 3 times then go to the calipers, and carry on as normal

 

[brad_barker12]

I wouldn't pump the pedal to the floor. That's what causes issues with the master cylinder. When pushing the pedal further than its normal day to day travel it can flip the seal in the master cylinder. It's well documented on the forum.

 

[alijawad]

Bleeding order is actually, left front, right front, left rear, right rear, as quoted from elsa.

On road test make sure you get abs to activate at least once.

This is as per elsa workshop manual

Adam thanks for all above info.
Please guide on "make sure you get abs to active at least once"
Secondly it's seat Leon 1.6 2002 the bleeding sequence your reckon is still the same?

Thanks

 

[Adam4D]

Bleeding is still same.

Activate abs at least once - aka perform an controlled emergency stop from say 30mph

 

[alijawad]

You mean emergency braking at 30mph? Also do I have any idea about reckon tyre pressure for Gunson ezzibleed?
Cheers

 

[Adam4D]

Gunson say 20psi max tool can hold in instructions.

Dealers will use a pressure bleeder set around 1 or 2 bar

 

[alijawad]

Thanks adam nice to get all help from u and others guys....