Master cylinder?
 

My wifes 03, 60,000 mi has a brake problem. The carstops fine, but if I continue to push the brake pedal down, it will go down almost to the floor in about 5-6 seconds. There is no loss of fluid, so I'm thinking master cylinder. Any thoughts? We bought it used, so this repair is on us :( Also, anyone try Rockauto.com for parts? Good prices, fast shipping.

RE: Master cylinder?
 

Chances are the master cylinder needs to be changed. The plungeris worn and allowing fluid to pass by it slowly

This is totally sick i cannot find any seller in here of second hand master cylinder for a santa fe. Anybody who knows who sells them in here? Ive been looking on ebay but didn't have any luck and just ended up to this thread page. If ever you have something to offer please let me know and post here some pictures and your contact number. Sorry for digging up i am just so frustrating. :mad:

Please don't. Using second had parts for your braking system is not very smart. Please buy a new master cylinder.


Hyundai sells new master cylinders. Check you local dealer.

Master cylinder not been a common occurrence on Santa Fe... I have change HECU on each one we have had for pedal feel issues..

Couple things you need to do ahead of time to eliminate possibility -

Flush the entire brake system,, old fluid loses it' temp capability, so it will boil at lower temp,, possible air bubbles in system due to boiling fluid, air not compress well.

Make sure calipers move freely across the mounts.. stuck pin/pins will goof the pedal..

Pads good

After the system squared away and it act goofy,, then very possible the HECU is bypassing fluid internally.. HECU is $$$, add labor, bleed complete again, then run HECU bleed mode with GDS a couple time to finish.