Visit me at: http://www.ericthecarguy.com/ This is one of those useful tips that can help you isolate where a brake pulsation is coming from, front or rear. Keep in mind this only works on some systems and if you have a pedal type parking brake be VERY careful doing this especially if you're on a public road as the rear wheels could lock up which would make for a very bad day, also be careful on wet roads for the same reason. Otherwise check your rear brake set up to find out if it's even possible to differentiate between the 2, remember if it's a disc brake set up with a drum brake inside the disc this method won't work so in that case you're just going to have to go by 'feel' and guess where the pulsation is coming from unless you have a micrometer with a magnet attachment that you can use to check for the runout. Stay dirty ETCG Due to factors beyond the control of EricTheCarGuy, it cannot guarantee against unauthorized modifications of this information, or improper use of this information. EricTheCarGuy assumes no liability for property damage or injury incurred as a result of any of the information contained in this video. EricTheCarGuy recommends safe practices when working with power tools, automotive lifts, lifting tools, jack stands, electrical equipment, blunt instruments, chemicals, lubricants, or any other tools or equipment seen or implied in this video. Due to factors beyond the control of EricTheCarGuy, no information contained in this video shall create any express or implied warranty or guarantee of any particular result. Any injury, damage or loss that may result from improper use of these tools, equipment, or the information contained in this video is the sole responsibility of the user and not EricTheCarGuy.